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	▲	kijin 8 days ago
		The usual solution is to wrap it with a closure. `function($x) { return array_key_exists('needle', $x); }` Or using the arrow function syntax: `fn($x) => array_key_exists('needle', $x)` The same trick also helps when you need to use functions with mandatory extra parameters, functions with pass-by-value parameters, etc.
	▲	moebrowne 7 days ago \| parent [-]
		If the Partial Function Application RFC passes then the closure wont be necessary https://wiki.php.net/rfc/partial_function_application_v2