Check error for php files.

pre-commit

#!/usr/bin/php
<?php

$output = array();
$return = 0;
exec('git rev-parse --verify HEAD 2> /dev/null', $output, $return);

exec("git diff-index --cached --name-only HEAD", $output);
exec("git diff-index --cached --name-only --diff-filter=D HEAD", $outputDels);
$filename_pattern = '/\.(php|ctp)$/';
$exit_status = 0;
foreach ($output as $file) {
    if (!preg_match($filename_pattern, $file) || in_array($file, $outputDels)) {
        // don't check files that aren't PHP
        continue;
    }

    $lint_output = array();
    exec("php -l " . escapeshellarg($file), $lint_output, $return);
    if ($return == 0) {
        continue;
    }
    echo implode("\n", $lint_output), "\n";
    $exit_status = 1;
}
exit($exit_status);