root/ext/tokenizer/tokenizer.php

<?php

if(!extension_loaded('tokenizer')) {
            dl('tokenizer.so');
}

$fp = fopen('php://stdin', 'r');
while (!feof($fp)) {
        $content .= fread($fp, 4096);
}
fclose($fp);

$tokens = token_get_all($content);

$count = count($tokens);
$state = 0;
for ($i = 0; $i < $count; $i++) {
        $token = $tokens[$i];
        if (is_array($token)) {
                if ($state == 1 && $token[0] == T_STRING) {
                        $token[1] = preg_replace('!([a-z])([A-Z])!e', '"$1_".strtolower("$2")', $token[1]);
                        $state = 0;
                } else if ($token[0] == T_FUNCTION) {
                        $state = 1;
                }
                $chunk = $token[1];
        } else {
                $chunk = $token;
        }
        $output .= $chunk;
}

print $output;

?>