45 lines
1.4 KiB
PHP
45 lines
1.4 KiB
PHP
<?php
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set_include_path(get_include_path() . PATH_SEPARATOR . realpath(dirname(__FILE__) . '/../../min/lib'));
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require 'HTTP/ConditionalGet.php';
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// emulate regularly updating document
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$every = 20;
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$lastModified = round(time()/$every)*$every - $every;
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$cg = new HTTP_ConditionalGet(array(
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'lastModifiedTime' => $lastModified
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));
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if ($cg->cacheIsValid) {
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$cg->sendHeaders();
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// we're done
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exit();
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}
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// generate content
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$title = 'Last-Modified is known : add Content-Length';
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$explain = '
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<p>Here, like <a href="./">the first example</a>, we know the Last-Modified time,
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but we also want to set the Content-Length to increase cacheability and allow
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HTTP persistent connections. Instead of sending headers immediately, we first
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generate our content, then use <code>setContentLength(strlen($content))</code>
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to add the header. Then finally call <code>sendHeaders()</code> and send the
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content.</p>
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<p><strong>Note:</strong> This is not required if your PHP config buffers all
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output and your script doesn\'t do any incremental flushing of the output
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buffer. PHP will generally set Content-Length for you if it can.</p>
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<p>This script emulates a document that changes every ' .$every. ' seconds.
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<br>This is version: ' . date('r', $lastModified) . '</p>
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';
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require '_include.php';
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$content = get_content(array(
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'title' => $title
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,'explain' => $explain
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));
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$cg->setContentLength(strlen($content));
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$cg->sendHeaders();
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send_slowly($content);
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