cyclomaticcomplexity/cc_php.php

<?php

function calculate($code)
{
	$complexity = 1;
	$decisionPoints = array(
			"case",
			"default",
			"catch",
			"if",
			"for",
			"foreach",
			"while",
			"do",
			"elseif"
	);

	$regexPoints = array();
	foreach ($decisionPoints as $token)
	{
		$regexPoints[] = "\b$token\b";
	}
	preg_match_all("/" . implode('|', $regexPoints) . "/", $code, $matches, PREG_OFFSET_CAPTURE);
	$complexity += count($matches[0]);
	return $complexity;
}