- var_dump: documentation ( source)
- usort: documentation ( source)
<?php
$list = [
['a' => 1, 'priority' => false],
['a' => 2, 'priority' => true],
['a' => 3, 'priority' => false],
['a' => 4, 'priority' => true],
];
usort ($list, static fn (array $a, array $b): int => (int)$b['priority'] <=> (int)$a['priority']);
var_dump($list);