in_array plugin method

pi.php

<?php

public function in_array()
{
	$haystack = $this->EE->TMPL->fetch_param('haystack', NULL);
	$needle = $this->EE->TMPL->fetch_param('needle', NULL);

	if ($haystack === NULL || $needle === NULL) {
		return;
	}

	$haystack = explode('|', $haystack);

	return in_array($needle, $haystack);
}