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<?php # Arrow Functions 2.0 `Short Closures` # OLD WAY (PHP < 7.4 ) function cube($arg){ return ($arg * $arg * $arg); } $b = array_map('cube', range(1, 5)); var_dump('Short closure old syntax', $b); # OR $b = array_map(function($a2) {return ($a2 * $a2 * $a2);}, range(1, 5)); var_dump('Short closure old syntax variant', $b); # ONLY FOR PHP 7.4 + #/!\ MORE CLEAR PHP CODE BEST PRACTIVE /!\ $b = array_map(fn($n) => $n * $n * $n, range(1, 5)); var_dump('Arrow Function 7.4 + syntax', $b); # OLD Example with closure herit in parent scope with `use` syntax $factor = 10; $oldcalc = function(int $num) use ($factor): int { return $num * $factor; }; var_dump('Short closure old syntax', $oldcalc(2)); # PHP 7.4 + syntax it allows us to build more readable and maintainable code. $oldcalc = fn(int $num): int => $num * $factor; var_dump('Arrow Function 7.4 + syntax', $oldcalc(2));