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<html><body>$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");print_r(array_keys($a));</body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_array_keys by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 05 Sep 2022 15:01:42 GMT --></html>