PHP: On success inject JavaScript to redirect to another page (+ pass url parameter)

example.php

<?php
	//pass a value to url parameter called param
	$value = 'value';

	//on success (eg: form sent) $var='trigger'
	if ($var=='trigger'){
		//redirect to url after 2 seconds
		echo '<script type="text/JavaScript">' . 'setTimeout("location.href =' . " 'http://www.example.com/?param=" . $value . "';" . '",2000);' . '</script>' ;
	}
?>

Create a Google Analytics Goal with regex to pick up the URL parameter and value, select; Admin > Account > Property > Goals
Regular expression examples: https://gist.github.com/latestscoop/7eb4e5c216230bebe209e9aaa16c4894

Import the goal to Google AdWords as a completion metric, select; Tools > Measurement > Conversions > Add > Import (from GA)