Example of using PHP Arrow functions

arrow_function_example.php

<?php

$foo = 'foo';
$functions = [
     'function1' => function ($bar) use ($foo) {
        return $foo . $bar;
    },
    'function2' => fn ($bar) => $foo . $bar
];
foreach ($functions as $function) {
      echo $function("bar");
     // will output "foobar" twice
}