<?php $indexes = [ 'id_1_2_3_0' => 1, 'id_1_2_-0.25_0' => 2, 'id_1_2_1.75_0' => 3, 'id_1_2_-4_0' => 4, 'id_1_2_0_0' => 5, 'id_1_2_-1.25_0' => 6, ]; uksort($indexes, function($a, $b) { return explode('_', $a) <=> explode('_', $b); }); var_export($indexes);
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