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<?php $array = [ "0" => 'Zero', 'foo' => 'Foo', 1 => 'One', ]; var_dump( array_key_exists(0, $array), array_key_exists("0", $array), array_key_exists(1, $array), array_key_exists("1", $array), );
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) bool(true) bool(true)

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