<?php

$a = function($b) use (&$a) {
    if (is_array($b)) {
        $r = array_map($a, $b);
    }
    else {
        $r = $b + 100;
    }
    
    return $r;
};

$b = range(1, 10);
$b[] = range(11, 13);

echo '<pre>';
dump(array_map($a, $b));
echo '</pre>';

^ array:11 [
  0 => 101
  1 => 102
  2 => 103
  3 => 104
  4 => 105
  5 => 106
  6 => 107
  7 => 108
  8 => 109
  9 => 110
  10 => array:3 [
    0 => 111
    1 => 112
    2 => 113
  ]
]

• Handling empty heaps
• Checking if a transaction is still open in PDO
• The magic of using traits

PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8