A function simple and quick for a dummy control on a text for the presence of any link. Useful for a first check on the body of an e-mail composed by a contact form

Check Link and Filter text

<?php

	$dspam = array("a href", "href", "[url", "[link", "www", "http", "@", "[at]", "mailto");

	function checkExtLink($text, $dspam) {

		$resp = 0;

		if (is_array($dspam) && !empty($dspam)) {

			foreach ($dspam as $key => $tofilter) {

				$offset = $pos = 0;

				while (is_integer($pos)) {

					$pos = strpos($text, $tofilter, $offset);

					if (is_integer($pos)) {

						$arrPos[] = $pos;
						$offset = ($pos + strlen($tofilter));

					}

				}

				if (isset($arrPos))
					$resp++;

			}

		}

		return $resp;

	}

	$res_text = "Lorem ipsum dolor";
	$check_spam = checkExtLink($res_text, $dspam);

	if (!empty($check_spam))
		echo "Possible spam into content of this e-mail";
	else
		echo "Content of this e-mail is clean from spam";