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<html><body>$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");print_r(array_change_key_case($age,CASE_UPPER));</body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_array_change_kc by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:22:33 GMT --></html>