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run code in 300+ PHP versions simultaneously
<?php $source = ["a" => 1, "b" => 2, "c" => 3]; echo json_encode(["d" => 4, "b" => 10] + $source) . PHP_EOL; echo json_encode(array_merge($source, ["d" => 4, "b" => 10])) . PHP_EOL;
Output for git.master, git.master_jit, rfc.property-hooks
{"d":4,"b":10,"a":1,"c":3} {"a":1,"b":10,"c":3,"d":4}

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