Check for forbidden words from array

This function will check in a string for words which are not allowed, defined in an array. Function is case-insensitive. So you are allowed to use only upper or lowercase letters.

function show_invalid_words($text, $array)
{
	for ($i = 0; $i < count($array); $i++)
	{
		if (preg_match("/$array[$i]/i", $text))
			return false;
	}

	return true;
}

Exmaple

$bad_words = array('this', 'andX');
echo (int)show_invalid_words('HELLO! This is jusT a phrase. Simple And well', $bad_words);

The above will out 0 as one of the words are found.

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