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run code in 300+ PHP versions simultaneously
<?php $a=array("a"=>1,"b"=>1,"c"=>1,"e"=>1); $b=array("a"=>5,"b"=>5,"c"=>7,"e"=>8); print_r(array_combine(array_keys($a),array_values($b)));

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36.68 ms | 402 KiB | 5 Q