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Comment by adlpz | Hacker News Reader

This article is very outdated. PHP has closures, can natively pass callables as arguments and you don't need any of these workarounds:

https://www.php.net/manual/en/functions.anonymous.php

It's not idiomatic to do so, but you can totally write sort of functional PHP nowadays without any tricks. Stuff like `array_map` exists since PHP 4.

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It's true. That whole first section on Functions as Arguments can be achieved as:

  $inc = function($number) {
    return $number + 1;
  };

  $x = [1, 2, 3, 4];

  array_map($inc, $x);

And you can also use the new syntax:

$inc = fn ($number) => $number + 1;

  $x = [1, 2, 3, 4];

  array_map($inc, $x);

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