<?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));
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