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<title>[55204] trunk: Filesystem API: Add directory support to `WP_Filesystem_Direct::move()`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/55204">55204</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/55204","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>azaozz</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-02-03 01:48:36 +0000 (Fri, 03 Feb 2023)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Filesystem API: Add directory support to `WP_Filesystem_Direct::move()`.

Introduces:
- New function: `wp_opcache_invalidate_directory()`, to recursively call `wp_opcache_invalidate()` after overwriting .php files.
- New function: `move_dir()`, similar to `copy_dir()` that uses `WP_Filesystem::move()` followed by `wp_opcache_invalidate_directory()`, and has a fallback to `copy_dir()`.

Props: costdev, afragen, peterwilsoncc, sergeybiryukov, ironprogrammer, flixos90, bronsonquick, mukesh27, azaozz.
Fixes <a href="https://core.trac.wordpress.org/ticket/57375">#57375</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludesclasswpfilesystemdirectphp">trunk/src/wp-admin/includes/class-wp-filesystem-direct.php</a></li>
<li><a href="#trunksrcwpadminincludesfilephp">trunk/src/wp-admin/includes/file.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunktestsphpunittestsfilesystemmoveDirphp">trunk/tests/phpunit/tests/filesystem/moveDir.php</a></li>
<li><a href="#trunktestsphpunittestsfilesystemwpOpcacheInvalidateDirectoryphp">trunk/tests/phpunit/tests/filesystem/wpOpcacheInvalidateDirectory.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadminincludesclasswpfilesystemdirectphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/class-wp-filesystem-direct.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/class-wp-filesystem-direct.php        2023-02-03 01:03:59 UTC (rev 55203)
+++ trunk/src/wp-admin/includes/class-wp-filesystem-direct.php  2023-02-03 01:48:36 UTC (rev 55204)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -316,8 +316,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * Moves a file.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  * Moves a file or directory.
</ins><span class="cx" style="display: block; padding: 0 10px">          *
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * After moving files or directories, OPcache will need to be invalidated.
+        *
+        * If moving a directory fails, `copy_dir()` can be used for a recursive copy.
+        *
+        * Use `move_dir()` for moving directories with OPcache invalidation and a
+        * fallback to `copy_dir()`.
+        *
</ins><span class="cx" style="display: block; padding: 0 10px">          * @since 2.5.0
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param string $source      Path to the source file.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -331,12 +338,18 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        return false;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                if ( $overwrite && $this->exists( $destination ) && ! $this->delete( $destination, true ) ) {
+                       // Can't overwrite if the destination couldn't be deleted.
+                       return false;
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 // Try using rename first. if that fails (for example, source is read only) try copy.
</span><span class="cx" style="display: block; padding: 0 10px">                if ( @rename( $source, $destination ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        return true;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( $this->copy( $source, $destination, $overwrite ) && $this->exists( $destination ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         // Backward compatibility: Only fall back to `::copy()` for single files.
+               if ( $this->is_file( $source ) && $this->copy( $source, $destination, $overwrite ) && $this->exists( $destination ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         $this->delete( $source );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        return true;
</span></span></pre></div>
<a id="trunksrcwpadminincludesfilephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/file.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/file.php      2023-02-03 01:03:59 UTC (rev 55203)
+++ trunk/src/wp-admin/includes/file.php        2023-02-03 01:48:36 UTC (rev 55204)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1947,6 +1947,75 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Moves a directory from one location to another.
+ *
+ * Recursively invalidates OPcache on success.
+ *
+ * If the renaming failed, falls back to copy_dir().
+ *
+ * Assumes that WP_Filesystem() has already been called and setup.
+ *
+ * @since 6.2.0
+ *
+ * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
+ *
+ * @param string $from      Source directory.
+ * @param string $to        Destination directory.
+ * @param bool   $overwrite Optional. Whether to overwrite the destination directory if it exists.
+ *                          Default false.
+ * @return true|WP_Error True on success, WP_Error on failure.
+ */
+function move_dir( $from, $to, $overwrite = false ) {
+       global $wp_filesystem;
+
+       if ( trailingslashit( strtolower( $from ) ) === trailingslashit( strtolower( $to ) ) ) {
+               return new WP_Error(
+                       'source_destination_same_move_dir',
+                       __( 'The source and destination are the same.' )
+               );
+       }
+
+       if ( ! $overwrite && $wp_filesystem->exists( $to ) ) {
+               return new WP_Error( 'destination_already_exists_move_dir', __( 'The destination folder already exists.' ), $to );
+       }
+
+       if ( $wp_filesystem->move( $from, $to, $overwrite ) ) {
+               /*
+                * When using an environment with shared folders,
+                * there is a delay in updating the filesystem's cache.
+                *
+                * This is a known issue in environments with a VirtualBox provider.
+                *
+                * A 200ms delay gives time for the filesystem to update its cache,
+                * prevents "Operation not permitted", and "No such file or directory" warnings.
+                *
+                * This delay is used in other projects, including Composer.
+                * @link https://github.com/composer/composer/blob/2.5.1/src/Composer/Util/Platform.php#L228-L233
+                */
+               usleep( 200000 );
+               wp_opcache_invalidate_directory( $to );
+
+               return true;
+       }
+
+       // Fall back to a recursive copy.
+       if ( ! $wp_filesystem->is_dir( $to ) ) {
+               if ( ! $wp_filesystem->mkdir( $to, FS_CHMOD_DIR ) ) {
+                       return new WP_Error( 'mkdir_failed_move_dir', __( 'Could not create directory.' ), $to );
+               }
+       }
+
+       $result = copy_dir( $from, $to, array( basename( $to ) ) );
+
+       // Clear the source directory.
+       if ( true === $result ) {
+               $wp_filesystem->delete( $from, true );
+       }
+
+       return $result;
+}
+
+/**
</ins><span class="cx" style="display: block; padding: 0 10px">  * Initializes and connects the WordPress Filesystem Abstraction classes.
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * This function will include the chosen transport and attempt connecting.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2557,3 +2626,65 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        return false;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+/**
+ * Attempts to clear the opcode cache for a directory of files.
+ *
+ * @since 6.2.0
+ *
+ * @see wp_opcache_invalidate()
+ * @link https://www.php.net/manual/en/function.opcache-invalidate.php
+ *
+ * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
+ *
+ * @param string $dir The path to the directory for which the opcode cache is to be cleared.
+ */
+function wp_opcache_invalidate_directory( $dir ) {
+       global $wp_filesystem;
+
+       if ( ! is_string( $dir ) || '' === trim( $dir ) ) {
+               if ( WP_DEBUG ) {
+                       $error_message = sprintf(
+                               /* translators: %s: The function name. */
+                               __( '%s expects a non-empty string.' ),
+                               '<code>wp_opcache_invalidate_directory()</code>'
+                       );
+                       // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
+                       trigger_error( $error_message );
+               }
+               return;
+       }
+
+       $dirlist = $wp_filesystem->dirlist( $dir, false, true );
+
+       if ( empty( $dirlist ) ) {
+               return;
+       }
+
+       /*
+        * Recursively invalidate opcache of files in a directory.
+        *
+        * WP_Filesystem_*::dirlist() returns an array of file and directory information.
+        *
+        * This does not include a path to the file or directory.
+        * To invalidate files within sub-directories, recursion is needed
+        * to prepend an absolute path containing the sub-directory's name.
+        *
+        * @param array  $dirlist Array of file/directory information from WP_Filesystem_Base::dirlist(),
+        *                        with sub-directories represented as nested arrays.
+        * @param string $path    Absolute path to the directory.
+        */
+       $invalidate_directory = function( $dirlist, $path ) use ( &$invalidate_directory ) {
+               $path = trailingslashit( $path );
+
+               foreach ( $dirlist as $name => $details ) {
+                       if ( 'f' === $details['type'] ) {
+                               wp_opcache_invalidate( $path . $name, true );
+                       } elseif ( is_array( $details['files'] ) && ! empty( $details['files'] ) ) {
+                               $invalidate_directory( $details['files'], $path . $name );
+                       }
+               }
+       };
+
+       $invalidate_directory( $dirlist, $dir );
+}
</ins></span></pre></div>
<a id="trunktestsphpunittestsfilesystemmoveDirphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/tests/phpunit/tests/filesystem/moveDir.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/filesystem/moveDir.php                          (rev 0)
+++ trunk/tests/phpunit/tests/filesystem/moveDir.php    2023-02-03 01:48:36 UTC (rev 55204)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,279 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * Tests move_dir().
+ *
+ * @group file.php
+ *
+ * @covers ::move_dir
+ */
+class Tests_Filesystem_MoveDir extends WP_UnitTestCase {
+
+       /**
+        * The test directory.
+        *
+        * @var string $test_dir
+        */
+       private static $test_dir;
+
+       /**
+        * The existing 'from' directory path.
+        *
+        * @var string $existing_from
+        */
+       private static $existing_from;
+
+       /**
+        * The existing 'from' sub-directory path.
+        *
+        * @var string $existing_from_subdir
+        */
+       private static $existing_from_subdir;
+
+       /**
+        * The existing 'from' file path.
+        *
+        * @var string $existing_from_file
+        */
+       private static $existing_from_file;
+
+       /**
+        * The existing 'from' sub-directory file path.
+        *
+        * @var string $existing_from_subdir_file
+        */
+       private static $existing_from_subdir_file;
+
+       /**
+        * The existing 'to' directory file path.
+        *
+        * @var string $existing_to
+        */
+       private static $existing_to;
+
+       /**
+        * The existing 'to' file path.
+        *
+        * @var string $existing_to_file
+        */
+       private static $existing_to_file;
+
+       /**
+        * Sets up the filesystem and directory structure properties
+        * before any tests run.
+        */
+       public static function set_up_before_class() {
+               parent::set_up_before_class();
+
+               require_once ABSPATH . 'wp-admin/includes/file.php';
+               WP_Filesystem();
+
+               self::$test_dir                  = get_temp_dir() . 'move_dir/';
+               self::$existing_from             = self::$test_dir . 'existing_from/';
+               self::$existing_from_subdir      = self::$existing_from . 'existing_from_subdir/';
+               self::$existing_from_file        = self::$existing_from . 'existing_from_file.txt';
+               self::$existing_from_subdir_file = self::$existing_from_subdir . 'existing_from_subdir_file.txt';
+               self::$existing_to               = self::$test_dir . 'existing_to/';
+               self::$existing_to_file          = self::$existing_to . 'existing_to_file.txt';
+       }
+
+       /**
+        * Sets up the directory structure before each test.
+        */
+       public function set_up() {
+               global $wp_filesystem;
+
+               parent::set_up();
+
+               // Create the root directory.
+               $wp_filesystem->mkdir( self::$test_dir );
+
+               // Create the "from" directory structure.
+               $wp_filesystem->mkdir( self::$existing_from );
+               $wp_filesystem->touch( self::$existing_from_file );
+               $wp_filesystem->mkdir( self::$existing_from_subdir );
+               $wp_filesystem->touch( self::$existing_from_subdir_file );
+
+               // Create the "to" directory structure.
+               $wp_filesystem->mkdir( self::$existing_to );
+               $wp_filesystem->touch( self::$existing_to_file );
+       }
+
+       /**
+        * Removes the test directory structure after each test.
+        */
+       public function tear_down() {
+               global $wp_filesystem;
+
+               // Delete the root directory and its contents.
+               $wp_filesystem->delete( self::$test_dir, true );
+
+               parent::tear_down();
+       }
+
+       /**
+        * Tests that move_dir() returns a WP_Error object.
+        *
+        * @ticket 57375
+        *
+        * @dataProvider data_should_return_wp_error
+        *
+        * @param string $from      The source directory path.
+        * @param string $to        The destination directory path.
+        * @param bool   $overwrite Whether to overwrite the destination directory.
+        * @param string $expected  The expected WP_Error code.
+        */
+       public function test_should_return_wp_error( $from, $to, $overwrite, $expected ) {
+               global $wp_filesystem;
+
+               $from   = self::$test_dir . $from;
+               $to     = self::$test_dir . $to;
+               $result = move_dir( $from, $to, $overwrite );
+
+               $this->assertWPError(
+                       $result,
+                       'move_dir() did not return a WP_Error object.'
+               );
+
+               $this->assertSame(
+                       $expected,
+                       $result->get_error_code(),
+                       'The expected error code was not returned.'
+               );
+
+               if ( 'source_destination_same_move_dir' !== $expected ) {
+                       $this->assertTrue(
+                               $wp_filesystem->exists( $from ),
+                               'The $from directory does not exist anymore.'
+                       );
+
+                       if ( false === $overwrite && 'existing_to' === untrailingslashit( $to ) ) {
+                               $this->assertTrue(
+                                       $wp_filesystem->exists( $to ),
+                                       'The $to directory does not exist anymore.'
+                               );
+                       }
+               }
+       }
+
+       /**
+        * Data provider.
+        *
+        * @return array[]
+        */
+       public function data_should_return_wp_error() {
+               return array(
+                       '$overwrite is false and $to exists' => array(
+                               'from'      => 'existing_from',
+                               'to'        => 'existing_to',
+                               'overwrite' => false,
+                               'expected'  => 'destination_already_exists_move_dir',
+                       ),
+                       'same source and destination, source has trailing slash' => array(
+                               'from'      => 'existing_from/',
+                               'to'        => 'existing_from',
+                               'overwrite' => false,
+                               'expected'  => 'source_destination_same_move_dir',
+                       ),
+                       'same source and destination, destination has trailing slash' => array(
+                               'from'      => 'existing_from',
+                               'to'        => 'existing_from/',
+                               'overwrite' => false,
+                               'expected'  => 'source_destination_same_move_dir',
+                       ),
+                       'same source and destination, source lowercase, destination uppercase' => array(
+                               'from'      => 'existing_from',
+                               'to'        => 'EXISTING_FROM',
+                               'overwrite' => false,
+                               'expected'  => 'source_destination_same_move_dir',
+                       ),
+                       'same source and destination, source uppercase, destination lowercase' => array(
+                               'from'      => 'EXISTING_FROM',
+                               'to'        => 'existing_from',
+                               'overwrite' => false,
+                               'expected'  => 'source_destination_same_move_dir',
+                       ),
+                       'same source and destination, source and destination in inverted case' => array(
+                               'from'      => 'ExIsTiNg_FrOm',
+                               'to'        => 'eXiStInG_fRoM',
+                               'overwrite' => false,
+                               'expected'  => 'source_destination_same_move_dir',
+                       ),
+               );
+       }
+
+       /**
+        * Tests that move_dir() successfully moves a directory.
+        *
+        * @ticket 57375
+        *
+        * @dataProvider data_should_move_directory
+        *
+        * @param string $from      The source directory path.
+        * @param string $to        The destination directory path.
+        * @param bool   $overwrite Whether to overwrite the destination directory.
+        */
+       public function test_should_move_directory( $from, $to, $overwrite ) {
+               global $wp_filesystem;
+
+               $from   = self::$test_dir . $from;
+               $to     = self::$test_dir . $to;
+               $result = move_dir( $from, $to, $overwrite );
+
+               $this->assertTrue(
+                       $result,
+                       'The directory was not moved.'
+               );
+
+               $this->assertFalse(
+                       $wp_filesystem->exists( $from ),
+                       'The source directory still exists.'
+               );
+
+               $this->assertTrue(
+                       $wp_filesystem->exists( $to ),
+                       'The destination directory does not exist.'
+               );
+
+               $dirlist = $wp_filesystem->dirlist( $to, true, true );
+
+               // Prevent PHP array sorting bugs from breaking tests.
+               $to_contents = array_keys( $dirlist );
+
+               $this->assertSameSets(
+                       array(
+                               'existing_from_file.txt',
+                               'existing_from_subdir',
+                       ),
+                       $to_contents,
+                       'The expected files were not moved.'
+               );
+
+               $this->assertSame(
+                       array( 'existing_from_subdir_file.txt' ),
+                       array_keys( $dirlist['existing_from_subdir']['files'] ),
+                       'Sub-directory files failed to move.'
+               );
+       }
+
+       /**
+        * Data provider.
+        *
+        * @return array[]
+        */
+       public function data_should_move_directory() {
+               return array(
+                       '$overwrite is false and $to does not exist' => array(
+                               'from'      => 'existing_from',
+                               'to'        => 'non_existing_to',
+                               'overwrite' => false,
+                       ),
+                       '$overwrite is true and $to exists'          => array(
+                               'from'      => 'existing_from',
+                               'to'        => 'existing_to',
+                               'overwrite' => true,
+                       ),
+               );
+       }
+
+}
</ins></span></pre></div>
<a id="trunktestsphpunittestsfilesystemwpOpcacheInvalidateDirectoryphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/tests/phpunit/tests/filesystem/wpOpcacheInvalidateDirectory.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/filesystem/wpOpcacheInvalidateDirectory.php                             (rev 0)
+++ trunk/tests/phpunit/tests/filesystem/wpOpcacheInvalidateDirectory.php       2023-02-03 01:48:36 UTC (rev 55204)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,101 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * Tests wp_opcache_invalidate_directory().
+ *
+ * @group file.php
+ *
+ * @covers ::wp_opcache_invalidate_directory
+ */
+class Tests_Filesystem_WpOpcacheInvalidateDirectory extends WP_UnitTestCase {
+
+       /**
+        * Sets up the filesystem before any tests run.
+        */
+       public static function set_up_before_class() {
+               global $wp_filesystem;
+
+               parent::set_up_before_class();
+
+               if ( ! $wp_filesystem ) {
+                       require_once ABSPATH . 'wp-admin/includes/file.php';
+                       WP_Filesystem();
+               }
+       }
+
+       /**
+        * Tests that wp_opcache_invalidate_directory() returns a WP_Error object
+        * when the $dir argument invalid.
+        *
+        * @ticket 57375
+        *
+        * @dataProvider data_should_trigger_error_with_invalid_dir
+        *
+        * @param mixed $dir An invalid directory path.
+        */
+       public function test_should_trigger_error_with_invalid_dir( $dir ) {
+               $this->expectError();
+               $this->expectErrorMessage(
+                       '<code>wp_opcache_invalidate_directory()</code>',
+                       'The expected error was not triggered.'
+               );
+
+               wp_opcache_invalidate_directory( $dir );
+       }
+
+       /**
+        * Data provider.
+        *
+        * @return array[]
+        */
+       public function data_should_trigger_error_with_invalid_dir() {
+               return array(
+                       'an empty string'                => array( '' ),
+                       'a string with spaces'           => array( '   ' ),
+                       'a string with tabs'             => array( "\t" ),
+                       'a string with new lines'        => array( "\n" ),
+                       'a string with carriage returns' => array( "\r" ),
+                       'int -1'                         => array( -1 ),
+                       'int 0'                          => array( 0 ),
+                       'int 1'                          => array( 1 ),
+                       'float -1.0'                     => array( -1.0 ),
+                       'float 0.0'                      => array( 0.0 ),
+                       'float 1.0'                      => array( 1.0 ),
+                       'false'                          => array( false ),
+                       'true'                           => array( true ),
+                       'null'                           => array( null ),
+                       'an empty array'                 => array( array() ),
+                       'a non-empty array'              => array( array( 'directory_path' ) ),
+                       'an empty object'                => array( new stdClass() ),
+                       'a non-empty object'             => array( (object) array( 'directory_path' ) ),
+                       'INF'                            => array( INF ),
+                       'NAN'                            => array( NAN ),
+               );
+       }
+
+       /**
+        * Tests that wp_opcache_invalidate_directory() does not trigger an error
+        * with a valid directory.
+        *
+        * @ticket 57375
+        *
+        * @dataProvider data_should_not_trigger_error_wp_opcache_valid_directory
+        *
+        * @param string $dir A directory path.
+        */
+       public function test_should_not_trigger_error_wp_opcache_valid_directory( $dir ) {
+               $this->assertNull( wp_opcache_invalidate_directory( $dir ) );
+       }
+
+       /**
+        * Data provider.
+        *
+        * @return array[]
+        */
+       public function data_should_not_trigger_error_wp_opcache_valid_directory() {
+               return array(
+                       'an existing directory'    => array( DIR_TESTDATA ),
+                       'a non-existent directory' => array( 'non_existent_directory' ),
+               );
+       }
+}
</ins></span></pre>
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