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run code in 300+ PHP versions simultaneously
<?php $f = ["start" => ["lat"=> 1.234, "long"=>4.2134], "end" => ["lat"=>4.314, "long"=>51.341]]; var_dump(array_keys($f));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(5) "start" [1]=> string(3) "end" }

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