1.2.1320. Use Arrow Functions¶

Arrow functions are closures that require one expression of code. They also include all the variables of the current context, unless they are made static.

Arrow functions were introduced in PHP 7.4. They added the reserved keyword fn.

<?php

array_map(fn(A $b): int => $b->c, $array);

function array_values_from_keys($arr, $keys) {
    return array_map(fn($x) => $arr[$x], $keys);
}
?>

See also RFC : Arrow functions and Arrow functions in PHP.

1.2.1320.1. Connex PHP features¶

arrow-function

1.2.1320.1.1. Specs¶

Short name	Functions/UseArrowFunctions
Rulesets	All, Appinfo, CE, Changed Behavior, One Liners
Exakat since	1.9.4
PHP Version	With PHP 7.4 and more recent
Severity
Time To Fix
Precision	Very high
Available in	Entreprise Edition, Community Edition, Exakat Cloud