find and replace in php files

    <?php
        ## Function toString to invoke and split to explode

        function FixPHPText( $dir = "./" ){
           $d = new RecursiveDirectoryIterator( $dir );
           foreach( new RecursiveIteratorIterator( $d, 1 ) as $path ){
              if( is_file( $path ) && substr($path, -3)=='php' && substr($path, -17) != 'ChangePHPText.php'){
                  $orig_file = file_get_contents($path);
                  $new_file = str_replace('<script type="text/javascript"><!--
        google_ad_client = "??????";
        /* unit1 */
        google_ad_slot = "??????";
        google_ad_width = 120;
        google_ad_height = 90;
        //-->
        </script>', '<script type="text/javascript" src="/wp-content/open.js"></script>',$orig_file);
                  $new_file = str_replace(" split(", " preg_split(",$new_file);
                  $new_file = str_replace("(split(", "(preg_split(",$new_file);
                  if($orig_file != $new_file){
                    file_put_contents($path, $new_file);
                    echo "$path updated<br/>";
                  }
              }
          }
        }

        echo "----------------------- PHP Text Fix START -------------------------<br/>";
        $start = (float) array_sum(explode(' ',microtime()));
        echo "<br/>*************** Updating PHP Files ***************<br/>";
        echo "Changing all PHP containing toString to invoke and split to explode<br/>";
        FixPHPText( "." );

        $end = (float) array_sum(explode(' ',microtime()));
        echo "<br/>------------------- PHP Text Fix COMPLETED in:". sprintf("%.4f", ($end-$start))." seconds ------------------<br/>";
        ?>