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<?php $numeric = ['foo', 'bar', 'qux']; $assoc = ['foo' => 'something', 'bar' => 'else', 'qux' => 'ya']; function isNumericKey(array $array) { return is_numeric(explode(array_keys($array))); } var_dump(isNumericKey($numeric)); var_dump(isNumericKey($assoc));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: explode() expects at least 2 arguments, 1 given in /in/rX4f2:7 Stack trace: #0 /in/rX4f2(7): explode(Array) #1 /in/rX4f2(10): isNumericKey(Array) #2 {main} thrown in /in/rX4f2 on line 7
Process exited with code 255.

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