<?php function foo($a, $b) { return $a[0] <=> $b[0] ?: $a[1] <=> $b[1] ?: $a[2] <=> $b[2] ?: 0; } $array = [ [1, 2, 3], [1, 3, 5], [1, 2, 4], [0, 2, 3], ]; usort($array, foo(...)); print_r($array);
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Value for `_results` contains invalid data `array`