External Libraries: Adopt standard get_temp_dir() in Text_Diff

src/wp-includes/Text/Diff.php

@@ -227,29 +227,7 @@ static function trimNewlines(&$line, $key)
      */
     static function _getTempDir()
     {
-        $tmp_locations = array('/tmp', '/var/tmp', 'c:\WUTemp', 'c:\temp',
-                               'c:\windows\temp', 'c:\winnt\temp');
-
-        /* Try PHP's upload_tmp_dir directive. */
-        $tmp = ini_get('upload_tmp_dir');
-
-        /* Otherwise, try to determine the TMPDIR environment variable. */
-        if (!strlen($tmp)) {
-            $tmp = getenv('TMPDIR');
-        }
-
-        /* If we still cannot determine a value, then cycle through a list of
-         * preset possibilities. */
-        while (!strlen($tmp) && count($tmp_locations)) {
-            $tmp_check = array_shift($tmp_locations);
-            if (@is_dir($tmp_check)) {
-                $tmp = $tmp_check;
-            }
-        }
-
-        /* If it is still empty, we have failed, so return false; otherwise
-         * return the directory determined. */
-        return strlen($tmp) ? $tmp : false;
+        return get_temp_dir();
     }
 
     /**

src/wp-includes/functions.php

@@ -2209,10 +2209,12 @@ function wp_normalize_path( $path ) {
  *
  * Function's preference is the return value of sys_get_temp_dir(),
  * followed by your PHP temporary upload directory, followed by WP_CONTENT_DIR,
- * before finally defaulting to /tmp/
+ * before finally defaulting to /tmp/.
+ *
+ * Note that sys_get_temp_dir honors the TMPDIR environment variable.
  *
  * In the event that this function does not find a writable location,
- * It may be overridden by the WP_TEMP_DIR constant in your wp-config.php file.
+ * it may be overridden by the WP_TEMP_DIR constant in your wp-config.php file.
  *
  * @since 2.5.0
  *