Pre commit hook.

pre-commit

#!/usr/bin/php
<?php

chdir (dirname(__FILE__).'/../../');
$root = realpath(getcwd()).'/';
define('ESC', "\033");

function is_tty() {
	static $is_tty = null;
	if (is_null($is_tty)) { $is_tty = posix_isatty(STDOUT); }
	return $is_tty;
}

function highlight($text) {
	if (is_tty()) {
		return ESC.'[0;36m'.$text.ESC."[0m";
	} else {
		return $text;
	}
}

// Maybe the best way of getting these files.
$git_text = `git status -s `;
if (! preg_match_all('/(A|M)(A|M|\?| ) (?P<file>.*)\n/', $git_text, $matches)) {
	return;
}
$filenames = $matches['file'];
$file_data = array();
foreach ($filenames as $filename) {
	preg_match('/\.(?P<ext>.*?)$/', $filename, $matches);
	$file_data [$filename] = array(
		'ext' => isset($matches['ext']) ? isset($matches['ext']): '',
		'fullpath' => $root.$filename,
		'string' => (is_tty()?highlight($root):'').$filename
	);
}

$found_bugs = array();

// add any functions here.
$functions_to_look_for = array('see', 'drop');
// Checking for the above functions.
foreach ($file_data as $filename => $data) {
	if ($data['ext'] == 'php') {
		$fh = fopen($root.$filename, 'r');
		$line_no = 1;
		while ($line = fgets($fh)) {
			if (preg_match($reg = '/\s*(?P<function_region>.*?)(?P<method>'.join('|', array_map('preg_quote', $functions_to_look_for)).')\s*\(/i', $line, $match) && ! preg_match('/function/i', $match['function_region']) && ! preg_match('/(#|\/\/)/', $match['function_region'])) { 
				$found_bugs ['debugging code'] []= array(
					'data' => $data, 
					'line' => $line_no
				);
			}
			$line_no++;
		}
	}
}

// checking all php files for error.
foreach ($file_data as $filename => $data) {
	if ($data['ext'] == 'php') {
		exec('php -l '.$data['fullpath'].' 2> /dev/null', $out);
		if (preg_match('/.error .* on line (?P<line>[0-9]+)/si', join("\n",$out), $matches)) {
			$found_bugs ['parsing'] []= array(
				'data' => $data,
				'line' => $matches['line']
			);
		}
	}
}

if ($found_bugs) {
	foreach ($found_bugs as $type => $bug_list) {
		echo "\nFound some errors related to ".highlight($type).":\n";
		foreach ($bug_list as $bug) {
			echo "\t".highlight($bug['data']['string']).':'.$bug['line']."\n";
		}
	}
	echo "\nNo need to thank me, citizen\n\n";
	die(1);
}

save this as .git/hooks/pre-commit in your project.