This PR was merged into the master branch.
Commits
-------
6703fb5 added changelog entries
1997e2e fix phpdoc of UrlGeneratorInterface that missed some exceptions and improve language of exception message
f0415ed [Routing] made reference type fully BC and improved phpdoc considerably
7db07d9 [Routing] added tests for generating relative paths and network paths
75f59eb [Routing] add support for path-relative and scheme-relative URL generation
Discussion
----------
[2.2] [Routing] add support for path-relative URL generation
Tests pass: yes
Feature addition: yes
BC break: <del>tiny (see below)</del> NO
deprecations: NO
At the moment the Routing component only supports absolute and domain-relative URLs, e.g.
`http://example.org/user-slug/article-slug/comments` and
`/user-slug/article-slug/comments`.
But there are two link types missing: schema-relative URLs and path-relative URLs.
schema-relative: e.g. `//example.org/user-slug/article-slug/comments`
path-relative: e.g. `comments`.
Both of them would now be possible with this PR. I think it closes a huge gap in the Routing component.
Use cases are pretty common. Schema-relative URLs are for example used when you want to include assets (scripts, images etc) in a secured website with HTTPS. Path-relative URLs are the only option when you want to generate static files (e.g. documentation) that can be downloaded as an HTML archive. Such use-cases are currently not possible with symfony.
The calculation of the relative path based on the request path and target path is hightly unit tested. So it is really equivalent. I found several implemenations on the internet but none of them worked in all cases. Mine is pretty short and works.
I also added an optional parameter to the twig `path` function, so this feature can also be used in twig templates.
Ref: This implements path-relative URLs as suggested in #3908.
<del>[BC BREAK] The signature of UrlGeneratorInterface::generate changed to support scheme-relative and path-relative URLs. The core UrlGenerator is BC and does not break anything, but users who implemented their own UrlGenerator need to be aware of this change. See UrlGenerator::convertReferenceType.</del>
---------------------------------------------------------------------------
by jalliot at 2012-04-16T09:56:56Z
@Tobion For completeness, you should add the option to the `url` and `asset` twig functions/template helpers.
---------------------------------------------------------------------------
by stof at 2012-04-16T10:46:06Z
@jalliot adding the option to ``url`` does not make any sense. The difference between ``path`` and ``url`` is that ``path`` generates a path and ``url`` generates an absolute url (thus including the scheme and the hostname)
---------------------------------------------------------------------------
by Tobion at 2012-04-16T12:27:49Z
@stof I guess jalliot meant we could then generate scheme-relative URLs with `url`. Otherwise this would have no equivalent in twig.
---------------------------------------------------------------------------
by jalliot at 2012-04-16T12:34:08Z
@stof Yep I meant what @Tobion said :)
---------------------------------------------------------------------------
by Tobion at 2012-04-18T11:57:04Z
The $relative parameter I added besides the existing $absolute parameter of the `->generate` method was not clear enough. So I merged those into a different parameter `referenceType`. I adjusted all parts of symfony to use the new signature. And also made the default `UrlGenerator` implementation BC with the old style. So almost nobody will recognize a change. The only BC break would be for somebody who implemented his own `UrlGenerator` and did not call the parent default generator.
Using `referenceType` instead of a simple Boolean is much more flexible. It will for example allow a custom generator to support a new reference type like http://en.wikipedia.org/wiki/CURIE
---------------------------------------------------------------------------
by Tobion at 2012-04-18T13:34:58Z
ping @schmittjoh considering your https://github.com/schmittjoh/JMSI18nRoutingBundle/blob/master/Router/I18nRouter.php would need a tiny change
---------------------------------------------------------------------------
by schmittjoh at 2012-04-18T13:37:39Z
Can you elaborate the necessary change?
---------------------------------------------------------------------------
by Tobion at 2012-04-18T13:51:10Z
This PR changes the signature of `generate` to be able to generate path-relative and scheme-relative URLs. So it needs to be
`public function generate($name, $parameters = array(), $referenceType = self::ABSOLUTE_PATH)` and your implementation would need to change `if ($absolute && $this->hostMap) {` to `if (self::ABSOLUTE_URL === $referenceType && $this->hostMap) {`
I can do a PR if this gets merged.
---------------------------------------------------------------------------
by schmittjoh at 2012-04-18T13:52:14Z
If I understand correctly, the old parameter still works, no?
edit: Ah, ok I see what you mean now.
---------------------------------------------------------------------------
by Tobion at 2012-04-18T13:56:33Z
Yeah the old parameter still works but $absolute would also evaluate to true (a string) in your case for non-absolute URLs, i.e. paths.
---------------------------------------------------------------------------
by Tobion at 2012-04-19T21:09:46Z
ping @fabpot
---------------------------------------------------------------------------
by fabpot at 2012-04-20T04:30:18Z
Let's discuss that feature for 2.2.
---------------------------------------------------------------------------
by Tobion at 2012-04-20T10:40:59Z
What are your objections against it? It's already implemented, it works and it adds support for things that are part of a web standard. The BC break is tiny at the moment (almost nobody is affected) because the core UrlGenerator works as before. But if we waited for 2.2 it will be much harder to make the transition because 2.1 is LTS. So I think is makes sense to add it now. Furthermore it makes it much more future-proof as custom generators can more easiliy add support for other link types like CURIE. At the moment a Boolean for absolute URLs is simply too limited and also somehow inconsistent because $absolute = false stands for an absolute path. You see the awkwardness in this naming.
Btw, I added a note in the changelog. And I will add documentation of this feature in symfony-docs once this is merged.
---------------------------------------------------------------------------
by fabpot at 2012-04-20T12:14:32Z
nobody has ever said that 2.1 would be LTS. Actually, I think we are going to wait for 2.3 for LTS.
---------------------------------------------------------------------------
by Tobion at 2012-04-20T12:27:18Z
Well what I meant is, the longer we wait with this, the harder to apply it.
In 04ac1fdba2 you modified `generate` signature for better extensibility that is not even made use of. I think changing `$abolute` param goes in the same direction and has direct use.
I'd like to know your reason to wait for 2.2. Not enough time to review it, or afraid of breaking something, or marketing for 2.2?
---------------------------------------------------------------------------
by stof at 2012-04-20T16:28:27Z
@Tobion the issue is that merging new features forces to postpone the release so that it is tested by enough devs first to be sure there is no blocking bug in it. Big changes cannot be merged when we are hunting the remaining bugs to be able to release.
---------------------------------------------------------------------------
by schmittjoh at 2012-04-20T16:42:11Z
Considering the changes that have been made to the Form component, and are still being made, I think this is in comparison to that a fairly minor change.
Maybe a clearer guideline on the release process, or the direction would help, and avoid confusion, or wrong expectations on contributors' part.
---------------------------------------------------------------------------
by Tobion at 2012-10-05T13:52:11Z
@fabpot this is ready. So if you agree with it, I would create a documentation PR.
---------------------------------------------------------------------------
by stof at 2012-10-13T16:09:47Z
@fabpot what do you think about this PR ?
---------------------------------------------------------------------------
by Crell at 2012-11-01T16:05:01Z
This feels like it's overloading the generate() method to do double duty: One, make a URl based on a route. Two, make a URI based on a URI snippet. Those are two separate operations. Why not just add a second method that does the second operation and avoid the conditionals? (We're likely to do that in Drupal for our own generator as well.)
---------------------------------------------------------------------------
by Tobion at 2012-11-01T16:38:39Z
@crell: No, you must have misunderstood something. The generate method still only generates a URI based on a route. The returned URI reference can now also be a relative path and a network path. Thats all.
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by Tobion at 2012-12-13T18:30:28Z
@fabpot this is ready. It is fully BC! I also improved phpdoc considerably.
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by Tobion at 2012-12-14T20:51:38Z
@fabpot Do you want me to write documentation for it? I would also be interested to write about the new features of the routing component in general. I wanted to do that anyway and it would probably be a good fit for your "new in symfony" articles.
---------------------------------------------------------------------------
by fabpot at 2012-12-14T20:58:16Z
Im' going to review this PR in the next coming days. And to answer your second question, more documentation or better documentation is always a good thing, so go for it.
---------------------------------------------------------------------------
by Tobion at 2013-01-02T21:50:20Z
@fabpot ping. I added changelog entries.
* 2.1:
[FrameworkBundle] added support for URIs as an argument to HttpKernel::render()
[FrameworkBundle] restricted the type of controllers that can be executed by InternalController
[Process] Allow non-blocking start with PhpProcess
Making it easier to grab the PR template.
[Locale] fixed a test
Fixed failing test
fix double-decoding in the routing system
Conflicts:
src/Symfony/Component/Process/PhpProcess.php
* 2.0:
[FrameworkBundle] added support for URIs as an argument to HttpKernel::render()
[FrameworkBundle] restricted the type of controllers that can be executed by InternalController
Making it easier to grab the PR template.
fix double-decoding in the routing system
Conflicts:
README.md
src/Symfony/Bundle/FrameworkBundle/EventListener/RouterListener.php
src/Symfony/Component/Security/Http/HttpUtils.php
* 2.1:
[Console] Add support for parsing terminal width/height on localized windows, fixes#5742
[Form] Fixed treatment of countables and traversables in Form::isEmpty()
refactor ControllerNameParser
[Form] Fixed FileType not to throw an exception when bound empty
- Test undefined index #
Maintain array structure
Check if key # is defined in $value
Update src/Symfony/Component/Validator/Resources/translations/validators.pl.xlf
* 2.1:
fixed CS
fixed CS
[Security] fixed path info encoding (closes#6040, closes#5695)
[HttpFoundation] added some tests for the previous merge and removed dead code (closes#6037)
Improved Cache-Control header when no-cache is sent
removed unneeded comment
Fix to allow null values in labels array
fix date in changelog
removed the Travis icon (as this is not stable enough -- many false positive, closes#6186)
Revert "merged branch gajdaw/finder_splfileinfo_fpassthu (PR #4751)" (closes#6224)
Fixed a typo
Fixed: HeaderBag::parseCacheControl() not parsing quoted zero correctly
[Form] Fix const inside an anonymous function
[Config] Loader::import must return imported data
[DoctrineBridge] Fixed caching in DoctrineType when "choices" or "preferred_choices" is passed
[Form] Fixed the default value of "format" in DateType to DateType::DEFAULT_FORMAT if "widget" is not "single_text"
[HttpFoundation] fixed a small regression
Conflicts:
src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/MongoDbSessionHandlerTest.php
* 2.1: (29 commits)
[DependencyInjection] fixed composer.json
[Validator] Fix typos in validators.ru.xlf
Edited some minor grammar and style errors in russian validation file
Updated Bulgarian translation
[Form] improve error message with a "hasser" hint for PropertyAccessDeniedException
[Form] Updated checks for the ICU version from 4.5+ to 4.7+ due to test failures with ICU 4.6
[Form] simplified a test from previous merge
Update src/Symfony/Component/Form/Extension/Core/Type/FileType.php
fixed CS
Xliff with other node than source or target are ignored
small fix of #5984 when the container param is not set
Filesystem Component mirror symlinked directory fix
[Process][Tests] fixed chainedCommandsOutput tests
fixed CS
Use better default ports in urlRedirectAction
Add tests for urlRedirectAction
info about session namespace
fix upgrade info about locale
Update src/Symfony/Component/DomCrawler/Tests/FormTest.php
Update src/Symfony/Component/DomCrawler/Form.php
...
* 2.0:
[DependencyInjection] fixed composer.json
[Form] Updated checks for the ICU version from 4.5+ to 4.7+ due to test failures with ICU 4.6
fixed CS
small fix of #5984 when the container param is not set
fixed CS
Use better default ports in urlRedirectAction
Add tests for urlRedirectAction
Update src/Symfony/Component/DomCrawler/Tests/FormTest.php
Update src/Symfony/Component/DomCrawler/Form.php
[Security] remove escape charters from username provided by Digest DigestAuthenticationListener
[Security] added test extra for digest authentication
fixed CS
[Security] Fixed digest authentication
[Security] Fixed digest authentication
[SecurityBundle] Convert Http method to uppercase in the config
Use Norm Data instead of Data
Conflicts:
src/Symfony/Bridge/Doctrine/Form/EventListener/MergeCollectionListener.php
src/Symfony/Bundle/FrameworkBundle/Controller/RedirectController.php
src/Symfony/Component/DependencyInjection/composer.json
this can happen when the config for the router is unset, but this method
does not need to depend on routing. reading an unset config would raise an exception.
Commits
-------
3f8127c fixed '0' problem
7bec460 fixed phpdoc
4c5bfab [FrameworkBundle] non-permanent redirect should be status code 404 according to spec
Discussion
----------
[FrameworkBundle] non-permanent redirect to unknown location with 404
according to spec: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html see 410 Gone
bc break: tiny when omitting 2 parameter (I can avoid this with `func_num_args` but i think its not necessary and makes the code strange and inconsistent)
* 2.0:
updated VERSION for 2.0.17
updated CHANGELOG for 2.0.17
updated vendors for 2.0.17
fixed XML decoding attack vector through external entities
prevents injection of malicious doc types
disabled network access when loading XML documents
refined previous commit
prevents injection of malicious doc types
standardized the way we handle XML errors
Redirects are now absolute
Conflicts:
CHANGELOG-2.0.md
src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
src/Symfony/Component/DomCrawler/Crawler.php
src/Symfony/Component/HttpKernel/Kernel.php
tests/Symfony/Tests/Component/DependencyInjection/Loader/XmlFileLoaderTest.php
tests/Symfony/Tests/Component/Routing/Loader/XmlFileLoaderTest.php
tests/Symfony/Tests/Component/Serializer/Encoder/XmlEncoderTest.php
tests/Symfony/Tests/Component/Translation/Loader/XliffFileLoaderTest.php
tests/Symfony/Tests/Component/Validator/Mapping/Loader/XmlFileLoaderTest.php
vendors.php
Commits
-------
887c0e9 moved EngineInterface::stream() to a new StreamingEngineInterface to keep BC with 2.0
473741b added the possibility to change a StreamedResponse callback after its creation
8717d44 moved a test in the constructor
e44b8ba made some cosmetic changes
0038d1b [HttpFoundation] added support for streamed responses
Discussion
----------
[HttpFoundation] added support for streamed responses
To stream a Response, use the StreamedResponse class instead of the
standard Response class:
$response = new StreamedResponse(function () {
echo 'FOO';
});
$response = new StreamedResponse(function () {
echo 'FOO';
}, 200, array('Content-Type' => 'text/plain'));
As you can see, a StreamedResponse instance takes a PHP callback instead of
a string for the Response content. It's up to the developer to stream the
response content from the callback with standard PHP functions like echo.
You can also use flush() if needed.
From a controller, do something like this:
$twig = $this->get('templating');
return new StreamedResponse(function () use ($templating) {
$templating->stream('BlogBundle:Annot:streamed.html.twig');
}, 200, array('Content-Type' => 'text/html'));
If you are using the base controller, you can use the stream() method instead:
return $this->stream('BlogBundle:Annot:streamed.html.twig');
You can stream an existing file by using the PHP built-in readfile() function:
new StreamedResponse(function () use ($file) {
readfile($file);
}, 200, array('Content-Type' => 'image/png');
Read http://php.net/flush for more information about output buffering in PHP.
Note that you should do your best to move all expensive operations to
be "activated/evaluated/called" during template evaluation.
Templates
---------
If you are using Twig as a template engine, everything should work as
usual, even if are using template inheritance!
However, note that streaming is not supported for PHP templates. Support
is impossible by design (as the layout is rendered after the main content).
Exceptions
----------
Exceptions thrown during rendering will be rendered as usual except that
some content might have been rendered already.
Limitations
-----------
As the getContent() method always returns false for streamed Responses, some
event listeners won't work at all:
* Web debug toolbar is not available for such Responses (but the profiler works fine);
* ESI is not supported.
Also note that streamed responses cannot benefit from HTTP caching for obvious
reasons.
---------------------------------------------------------------------------
by Seldaek at 2011/12/21 06:34:13 -0800
Just an idea: what about exposing flush() to twig? Possibly in a way that it will not call it if the template is not streaming. That way you could always add a flush() after your </head> tag to make sure that goes out as fast as possible, but it wouldn't mess with non-streamed responses. Although it appears flush() doesn't affect output buffers, so I guess it doesn't need anything special.
When you say "ESI is not supported.", that means only the AppCache right? I don't see why this would affect Varnish, but then again as far as I know Varnish will buffer if ESI is used so the benefit of streaming there is non-existent.
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by cordoval at 2011/12/21 08:04:21 -0800
wonder what the use case is for streaming a response, very interesting.
---------------------------------------------------------------------------
by johnkary at 2011/12/21 08:19:48 -0800
@cordoval Common use cases are present fairly well by this RailsCast video: http://railscasts.com/episodes/266-http-streaming
Essentially it allows faster fetching of web assets (JS, CSS, etc) located in the <head></head>, allowing those assets to be fetched as soon as possible before the remainder of the content body is computed and sent to the browser. The end goal is to improve page load speed.
There are other uses cases too like making large body content available quickly to the service consuming it. Think if you were monitoring a live feed of JSON data of newest Twitter comments.
---------------------------------------------------------------------------
by lsmith77 at 2011/12/21 08:54:35 -0800
How does this relate the limitations mentioned in:
http://yehudakatz.com/2010/09/07/automatic-flushing-the-rails-3-1-plan/
Am I right to understand that due to how twig works we are not really streaming the content pieces when we call render(), but instead the entire template with its layout is rendered and only then will we flush? or does it mean that the render call will work its way to the top level layout template and form then on it can send the content until it hits another block, which it then first renders before it continues to send the data?
---------------------------------------------------------------------------
by stof at 2011/12/21 09:02:53 -0800
@lsmith77 this is why the ``stream`` method calls ``display`` in Twig instead of ``render``. ``display`` uses echo to print the output of the template line by line (and blocks are simply method calls in the middle). Look at your compiled templates to see it (the ``doDisplay`` method)
Rendering a template with Twig simply use an output buffer around the rendering.
---------------------------------------------------------------------------
by fabpot at 2011/12/21 09:24:33 -0800
@lsmith77: We don't have the Rails problem thanks to Twig as the order of execution is the right one by default (the layout is executed first); it means that we can have the flush feature without any change to how the core works. As @stof mentioned, we are using `display`, not `render`, so we are streaming your templates for byte one.
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by fabpot at 2011/12/21 09:36:41 -0800
@Seldaek: yes, I meant ESI with the PHP reverse proxy.
---------------------------------------------------------------------------
by fabpot at 2011/12/21 09:37:34 -0800
@Seldaek: I have `flush()` support for Twig on my todo-list. As you mentioned, It should be trivial to implement.
---------------------------------------------------------------------------
by fzaninotto at 2011/12/21 09:48:18 -0800
How do streaming responses deal with assets that must be called in the head, but are declared in the body?
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by fabpot at 2011/12/21 09:52:12 -0800
@fzaninotto: What do you mean?
With Twig, your layout is defined with blocks ("holes"). These blocks are overridden by child templates, but evaluated as they are encountered in the layout. So, everything works as expected.
As noted in the commit message, this does not work with PHP templates for the problems mentioned in the Rails post (as the order of execution is not the right one -- the child template is first evaluated and then the layout).
---------------------------------------------------------------------------
by fzaninotto at 2011/12/21 10:07:35 -0800
I was referring to using Assetic. Not sure if this compiles to Twig the same way as javascript and stylesheet blocks placed in the head - and therefore executed in the right way.
---------------------------------------------------------------------------
by fabpot at 2011/12/21 10:34:59 -0800
@Seldaek: I've just added a `flush` tag in Twig 1.5: 1d6dfad4f5
---------------------------------------------------------------------------
by catchamonkey at 2011/12/21 13:29:22 -0800
I'm really happy you've got this into the core, it's a great feature to have! Good work.
To stream a Response, use the StreamedResponse class instead of the
standard Response class:
$response = new StreamedResponse(function () {
echo 'FOO';
});
$response = new StreamedResponse(function () {
echo 'FOO';
}, 200, array('Content-Type' => 'text/plain'));
As you can see, a StreamedResponse instance takes a PHP callback instead of
a string for the Response content. It's up to the developer to stream the
response content from the callback with standard PHP functions like echo.
You can also use flush() if needed.
From a controller, do something like this:
$twig = $this->get('templating');
return new StreamedResponse(function () use ($templating) {
$templating->stream('BlogBundle:Annot:streamed.html.twig');
}, 200, array('Content-Type' => 'text/html'));
If you are using the base controller, you can use the stream() method instead:
return $this->stream('BlogBundle:Annot:streamed.html.twig');
You can stream an existing file by using the PHP built-in readfile() function:
new StreamedResponse(function () use ($file) {
readfile($file);
}, 200, array('Content-Type' => 'image/png');
Read http://php.net/flush for more information about output buffering in PHP.
Note that you should do your best to move all expensive operations to
be "activated/evaluated/called" during template evaluation.
Templates
---------
If you are using Twig as a template engine, everything should work as
usual, even if are using template inheritance!
However, note that streaming is not supported for PHP templates. Support
is impossible by design (as the layout is rendered after the main content).
Exceptions
----------
Exceptions thrown during rendering will be rendered as usual except that
some content might have been rendered already.
Limitations
-----------
As the getContent() method always returns false for streamed Responses, some
event listeners won't work at all:
* Web debug toolbar is not available for such Responses (but the profiler works fine);
* ESI is not supported.
Also note that streamed responses cannot benefit from HTTP caching for obvious
reasons.
Commits
-------
cd24fb8 change explode's limit parameter based on known variable content
b3cc270 minor optimalisations for explode
Discussion
----------
[FrameworkBundle][CssSelector][HttpFoundation][HttpKernel] [Security][Validator] Minor optimizations for "explode" function
Bug fix: no
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -
I added limit parameter in some places, where it may be usefull. I did not check the context of what values may have been exploded. So to not break anything, I added +1 to limit parameter.
If you find out that in some places limit (or limit+1) is not important or meaningless, write a comment please and I will fix it.
---------------------------------------------------------------------------
by fabpot at 2011/12/07 06:56:49 -0800
Adding +1 just to be sure to not break anything is clearly something we won't do. What is the benefit of doing that anyway?
---------------------------------------------------------------------------
by pulzarraider at 2011/12/07 13:50:24 -0800
The main idea of making this PR was to notify about some places that may run faster with just adding one parameter to explode function.
If in code is someting like: ```list($a, $b) = explode(':', $s);```
Function ```explode``` will create n-items (depends on ```$s```), but we need in code only the first two items. There is no reason to let ```explode``` create more items in memory that are NEVER used in our code. The limit parameter is there for these situations, so let's use it.
I know that it is microoptimization and may look unimportant, but we are writing a framework - so people expect that code will be as fast as possible without this kind of mistakes.
As I've noticed above, I know that +1 is not ideal solution, but the fastest without debugging the code. I expect that someone (with good knowledge of that code) will look at it and write in comments if variable may contain 1 comma (dot or someting on what is doing the explode) or maybe 2 in some situations or more.
Anyway, +1 will not break anything, because same items are created as it is now, but no unnecessary item is created.
---------------------------------------------------------------------------
by fabpot at 2011/12/07 23:14:59 -0800
I'm +1 for adding the number to avoid problems but I'm -1 on the optimization side of things as it won't optimize anything.
---------------------------------------------------------------------------
by helmer at 2011/12/08 12:46:49 -0800
*.. The main idea of making this PR was to notify about some places that **may** run faster ..*
I am also unsure the optimization is really an optimization, care to benchmark (with meaningful inputs)? As for the limit+1 thing, why would you want to +1 it? The number of ``list`` arguments should always reflect the ``limit`` parameter, no?
---------------------------------------------------------------------------
by pulzarraider at 2011/12/08 23:11:34 -0800
@helmer please try this simple benchmark:
```
<?php
header('Content-Type: text/plain; charset=UTF-8');
define('COUNT', 10000);
$source_string = 'aaaaaaaaaaaaaaaaaaaa:bbbbbbbbbbbbbbbbbbbbb:cccccccccccccccccccccccc:dddddddddddddddddddddd:eeeeeeeeeeeeeeeeeeeeeeeee:fffffffffffffffffffffffffff';
$start = microtime(true);
for ($i = 0; $i < COUNT; $i++) {
list($a, $b) = explode(':', $source_string);
}
$end = microtime(true)-$start;
echo 'without limit: '.$end."\n";
$start = microtime(true);
for ($i = 0; $i < COUNT; $i++) {
list($a, $b) = explode(':', $source_string, 2);
}
$end = microtime(true)-$start;
echo 'with limit: '.$end."\n";
```
My results are:
```
without limit: 0.057228803634644
with limit: 0.028676986694336
```
That is 50% difference (with APC enabled). Of course the result depends on the length of source string and if it's too short, the difference may be none or very very small. That's why I said, that it **may** run faster and is just a micro optimization.
---------------------------------------------------------------------------
by pulzarraider at 2011/12/08 23:18:12 -0800
@helmer And why +1? It depends on a code:
```
$source_string = 'aaaaaaaaaaaaaaaaaaaa:bbbbbbbbbbbbbbbbbbbbb:cccccccccccccccccccccccc';
list($a, $b) = explode(':', $source_string, 2);
var_dump($a, $b);
```
and
```
$source_string = 'aaaaaaaaaaaaaaaaaaaa:bbbbbbbbbbbbbbbbbbbbb:cccccccccccccccccccccccc';
list($a, $b) = explode(':', $source_string, 3);
var_dump($a, $b);
```
gives different results. That's why the content of the variable must be known.
---------------------------------------------------------------------------
by helmer at 2011/12/09 00:08:28 -0800
@pulzarraider Thanks for the benchmark, seems like a gain enough. Although, we are more likely having a scenario of:
``explode(':', 'a🅱️c')`` vs ``explode(':', 'a🅱️c', 3)`` with a ``COUNT`` of 10, where the difference is not even in microseconds anymore :)
The limit addition alters the behaviour though, ie suddenly you can define a controller [logical name](http://symfony.com/doc/current/book/routing.html#controller-string-syntax) as ´´AcmeBlogBundle:Blog:show:something``, and things go downhill from there on.
All that aside, I'm +1 for setting the limit to the exact number of ``list`` parameters, but certainly not number+1, this is just too wtfy (as you said, this was a safety thing, but I reckon for this PR to be merged it needs to be +0).
---------------------------------------------------------------------------
by drak at 2011/12/09 08:28:58 -0800
Overall `list()` is ugly as it's not very explicit. Even though it would mean extra lines, it's better to `explode()` then explicitly assign variables:
```
$parts = explode(':', $foo);
$name = $parts[0];
$tel = $parts[1];
```
`list()` is one of those bad relics from the PHP past...
---------------------------------------------------------------------------
by fabpot at 2011/12/11 10:07:47 -0800
@drak: why is `list` not explicit? It is in fact as explicit as the more verbose syntax you propose.
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by pulzarraider at 2011/12/11 13:08:50 -0800
@drak: I agree with @fabpot. In speech of benchmarks ```list``` is faster then using a helper variable.
@fabpot, @helmer I've changed explode's limit to be correct (without +1) and removed some changes from this PR, where I can't find out what the content of variable may be. Unit tests pass, so I think it's ready for merge.
