<html><body>$a=array("Volvo","BMW");if (array_key_exists(0,$a)) { echo "Key exists!"; }else { echo "Key does not exist!"; }</body><!-- Mirrored from www.w3schools.com/php7/phptryit.asp?filename=tryphp_func_array_key_exists3 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 13:40:33 GMT --></html>