<?php $pages = [ 'a' => ['title' => 'A'], 'c' => ['title' => 'C'], 'b' => ['title' => 'B'], 'n' => ['title' => '.N'], ]; uasort($pages, fn($a, $b) => preg_replace('_^[^0-9a-z]*_', '', strtolower($a['title'])) <=> preg_replace('_^[^0-9a-z]*_', '', strtolower($b['title'])) ); echo implode(', ', array_map(fn($page) => $page['title'], $pages));
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