Checking if string appears in content.

Hi,

Im trying to determine weather or not a string appears within the content. The aim is to right a function i can call to check this, returning a simple true or false. I’ve been trying to do this with the bellow code, but i always get the response ($dResponce) returned as true.

I’ve tested the “if ($test === false) {…” bit and it works fine, but it is not setting the value of dataResponce(). If i put echo’s in that part the right answer is displayed.

My code is pasted bellow. Any suggestions would be greatly appreciated.

Many Thanks.

function dataResponce($dResponce) {
			if ($dResponce = true) {
				echo "true";
			}
			elseif ($dResponce = false) {
				echo "false";
			}
		}

		function in_this_instance($data) {
			$rep_val = '[front banner]';
			$test = strpos($data, $rep_val);
			if ($test === false) {
				dataResponce(false);
			}
			else {
				dataResponce(true);
			}
			return $data;
		}

add_filter('the_content', 'in_this_instance');