tokenizer based php opening tags conversion

convert.php

<?php
# use builtin PHP tokenizer to convert opening tags
# based on http://stackoverflow.com/questions/684587/batch-script-to-replace-php-short-open-tags-with-php/1647429#1647429

function convert($file) {
    $content = file_get_contents($file);
    $tokens = token_get_all($content);
    $output = '';

    foreach($tokens as $token) {
        if(is_array($token)) {
            list($index, $code, $line) = $token;
            switch($index) {
                case T_OPEN_TAG_WITH_ECHO:
                    $output .= '<?php echo ';
                    break;
                case T_OPEN_TAG:
                    $output .= '<?php ';
                    break;
                default:
                    $output .= $code;
                    break;
            }
        }
       else {
          $output .= $token;
       }
    }
    return $output;
}

echo convert($argv[1]);

?>

convert.sh

#!/bin/sh
# 
# shell script to convert old opening tags php file to new format
# usage example : find . -iname '*.php' -exec ./convert.sh {} \;
#

echo "converting $1"
tmp="$1.TMP"
php -n -f convert.php $1 > $tmp;
mv $tmp $1;