3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = Array ( 0 => Array ( 'hashtag' => 'a7e87329b5eab8578f4f1098a152d6f4', 'title' => 'Flower', 'order' => 3, ), 1 => Array ( 'hashtag' => 'b24ce0cd392a5b0b8dedc66c25213594', 'title' => 'Free', 'order' => 2, ), 2 => Array ( 'hashtag' => 'e7d31fc0602fb2ede144d18cdffd816b', 'title' => 'Ready', 'order' => 1, ) ); usort($array, function($a, $b) { return [$a['order'], $b['title']] <=> [$b['order'], $a['title']]; }); print_r($array);

preferences:
28.32 ms | 405 KiB | 5 Q