wp-admin/includes/class-wp-filesystem-direct.php:161Changes filesystem permissions.
$filestring$modeint|falseoptionalfalse$recursivebooloptionalfalsebool public function chmod( $file, $mode = false, $recursive = false ) { if ( ! $mode ) { if ( $this->is_file( $file ) ) { $mode = FS_CHMOD_FILE; } elseif ( $this->is_dir( $file ) ) { $mode = FS_CHMOD_DIR; } else { return false; } } if ( ! $recursive || ! $this->is_dir( $file ) ) { $current_mode = fileperms( $file ) & 0777 | 0644; /* * fileperms() populates the stat cache, so have to clear it * to maintain parity with the previous behavior. */ clearstatcache( true, $file ); /* * Avoid calling chmod() if the requested mode is already set, * to prevent throwing a warning when we aren't the owner. */ if ( $current_mode === $mode ) { return true; } return chmod( $file, $mode ); } // Is a directory, and we want recursive. $file = trailingslashit( $file ); $filelist = $this->dirlist( $file ); foreach ( (array) $filelist as $filename => $filemeta ) { $this->chmod( $file . $filename, $mode, $recursive ); } return true; }Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-filesystem-direct.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.