TempFSFile.php

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<?php
class TempFSFile extends FSFile {
        protected $canDelete = false; // bool; garbage collect the temp file

        protected static $instances = array();

        public static function factory( $prefix, $extension = '' ) {
                wfProfileIn( __METHOD__ );
                $base = wfTempDir() . '/' . $prefix . wfRandomString( 12 );
                $ext = ( $extension != '' ) ? ".{$extension}" : "";
                for ( $attempt = 1; true; $attempt++ ) {
                        $path = "{$base}-{$attempt}{$ext}";
                        wfSuppressWarnings();
                        $newFileHandle = fopen( $path, 'x' );
                        wfRestoreWarnings();
                        if ( $newFileHandle ) {
                                fclose( $newFileHandle );
                                break; // got it
                        }
                        if ( $attempt >= 5 ) {
                                wfProfileOut( __METHOD__ );
                                return null; // give up
                        }
                }
                $tmpFile = new self( $path );
                $tmpFile->canDelete = true; // safely instantiated
                wfProfileOut( __METHOD__ );
                return $tmpFile;
        }

        public function purge() {
                $this->canDelete = false; // done
                wfSuppressWarnings();
                $ok = unlink( $this->path );
                wfRestoreWarnings();
                return $ok;
        }

        public function bind( $object ) {
                if ( is_object( $object ) ) {
                        $object->tempFSFileReferences[] = $this;
                }
        }

        public function preserve() {
                $this->canDelete = false;
        }

        public function autocollect() {
                $this->canDelete = true;
        }

        function __destruct() {
                if ( $this->canDelete ) {
                        wfSuppressWarnings();
                        unlink( $this->path );
                        wfRestoreWarnings();
                }
        }
}