feature #29661 [Filesystem] Support resources and deprecate using arrays in dumpFile() and appendToFile() (thewilkybarkid)

This PR was squashed before being merged into the 4.3-dev branch (closes #29661).

Discussion
----------

[Filesystem] Support resources and deprecate using arrays in dumpFile() and appendToFile()

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Running PHPStan on my project picked up that passing a resource to `Filesystem::dumpFile()` didn't match the documented type.

I found this has been discussed in #20980 and #28019, without a clear result. But, my reading is that only strings should be supported. While I think that not supporting streams makes this a lot less useful (and I'm going to switch away from it), this does need to be resolved. So, I've deprecated using arrays and resources.

Commits
-------

0eaf9d2474 [Filesystem] Support resources and deprecate using arrays in dumpFile() and appendToFile()

UPGRADE-5.0.md

@@ -70,6 +70,12 @@ EventDispatcher
 
  * The `TraceableEventDispatcherInterface` has been removed.
 
+Filesystem
+----------
+
+ * The `Filesystem::dumpFile()` method no longer supports arrays in the `$content` argument.
+ * The `Filesystem::appendToFile()` method no longer supports arrays in the `$content` argument.
+
 Finder
 ------
 

src/Symfony/Component/Filesystem/CHANGELOG.md

@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+4.3.0
+-----
+
+ * support for passing arrays to `Filesystem::dumpFile()` is deprecated and will be removed in 5.0
+ * support for passing arrays to `Filesystem::appendToFile()` is deprecated and will be removed in 5.0
+
 4.0.0
 -----
 

src/Symfony/Component/Filesystem/Filesystem.php

@@ -670,13 +670,17 @@ class Filesystem
     /**
      * Atomically dumps content into a file.
      *
-     * @param string $filename The file to be written to
-     * @param string $content  The data to write into the file
+     * @param string          $filename The file to be written to
+     * @param string|resource $content  The data to write into the file
      *
      * @throws IOException if the file cannot be written to
      */
     public function dumpFile($filename, $content)
     {
+        if (\is_array($content)) {
+            @trigger_error(sprintf('Calling "%s()" with an array in the $content argument is deprecated since Symfony 4.3.', __METHOD__), E_USER_DEPRECATED);
+        }
+
         $dir = \dirname($filename);
 
         if (!is_dir($dir)) {
@@ -703,13 +707,17 @@ class Filesystem
     /**
      * Appends content to an existing file.
      *
-     * @param string $filename The file to which to append content
-     * @param string $content  The content to append
+     * @param string          $filename The file to which to append content
+     * @param string|resource $content  The content to append
      *
      * @throws IOException If the file is not writable
      */
     public function appendToFile($filename, $content)
     {
+        if (\is_array($content)) {
+            @trigger_error(sprintf('Calling "%s()" with an array in the $content argument is deprecated since Symfony 4.3.', __METHOD__), E_USER_DEPRECATED);
+        }
+
         $dir = \dirname($filename);
 
         if (!is_dir($dir)) {

src/Symfony/Component/Filesystem/Tests/FilesystemTest.php

@@ -1518,6 +1518,10 @@ class FilesystemTest extends FilesystemTestCase
         }
     }
 
+    /**
+     * @group legacy
+     * @expectedDeprecation Calling "Symfony\Component\Filesystem\Filesystem::dumpFile()" with an array in the $content argument is deprecated since Symfony 4.3.
+     */
     public function testDumpFileWithArray()
     {
         $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
@@ -1600,6 +1604,60 @@ class FilesystemTest extends FilesystemTestCase
         }
     }
 
+    /**
+     * @group legacy
+     * @expectedDeprecation Calling "Symfony\Component\Filesystem\Filesystem::appendToFile()" with an array in the $content argument is deprecated since Symfony 4.3.
+     */
+    public function testAppendToFileWithArray()
+    {
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'bar.txt';
+
+        // skip mode check on Windows
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
+            $oldMask = umask(0002);
+        }
+
+        $this->filesystem->dumpFile($filename, 'foo');
+
+        $this->filesystem->appendToFile($filename, array('bar'));
+
+        $this->assertFileExists($filename);
+        $this->assertStringEqualsFile($filename, 'foobar');
+
+        // skip mode check on Windows
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
+            $this->assertFilePermissions(664, $filename);
+            umask($oldMask);
+        }
+    }
+
+    public function testAppendToFileWithResource()
+    {
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'bar.txt';
+
+        // skip mode check on Windows
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
+            $oldMask = umask(0002);
+        }
+
+        $this->filesystem->dumpFile($filename, 'foo');
+
+        $resource = fopen('php://memory', 'rw');
+        fwrite($resource, 'bar');
+        fseek($resource, 0);
+
+        $this->filesystem->appendToFile($filename, $resource);
+
+        $this->assertFileExists($filename);
+        $this->assertStringEqualsFile($filename, 'foobar');
+
+        // skip mode check on Windows
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
+            $this->assertFilePermissions(664, $filename);
+            umask($oldMask);
+        }
+    }
+
     public function testAppendToFileWithScheme()
     {
         $scheme = 'file://';