Lint all PHP source files in a directory

php_lint.php

<?php 
$dh = opendir('.');
while (false !== ($filename = readdir($dh))) 
{
    $files[] = $filename;
}
sort($files);
foreach( $files as $file)
{
if(
preg_match( '/.php$/',$file) ||  preg_match( '/.inc$/',$file)  ) 
{
echo shell_exec("php -l $file");
}
}