Code Modernization: Use `file_get_contents()` in `get_file_data()`.

`file_get_contents()` is faster than `fread()`, because the PHP core can decide how to best read the remaining file; it could decide to issue just one `read()` call or `mmap()` the file first.

Per the PHP manual, `file_get_contents()` or `stream_get_contents()` is the preferred way to read the contents of a file into a string. It will use memory mapping techniques if supported by the OS to enhance performance.

Reference: [https://www.php.net/manual/en/function.file-get-contents.php PHP Manual: file_get_contents()].

Follow-up to [12044], [49073], [52696].

Props maxkellermann.
See #55069.
Built from https://develop.svn.wordpress.org/trunk@52698


git-svn-id: http://core.svn.wordpress.org/trunk@52287 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -6566,16 +6566,10 @@ function wp_scheduled_delete() {
  * @return string[] Array of file header values keyed by header name.
  */
 function get_file_data( $file, $default_headers, $context = '' ) {
-	// We don't need to write to the file, so just open for reading.
-	$fp = fopen( $file, 'r' );
+	// Pull only the first 8 KB of the file in.
+	$file_data = file_get_contents( $file, false, null, 0, 8 * KB_IN_BYTES );
 
-	if ( $fp ) {
-		// Pull only the first 8 KB of the file in.
-		$file_data = fread( $fp, 8 * KB_IN_BYTES );
-
-		// PHP will close file handle, but we are good citizens.
-		fclose( $fp );
-	} else {
+	if ( false === $file_data ) {
 		$file_data = '';
 	}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52697';
+$wp_version = '6.0-alpha-52698';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.