<?php $array = [["4|1","4|3","4|6"],[["4|1|2","4|1|8"],["4|3|4","4|3|9"],["4|6|5","4|6|12"]]]; foreach ($array as $key => $value) { if($key == 0) { foreach ($value as $key => $v) { $new_array[] = $v; } } else { foreach ($value as $key => $s_value) { foreach ($s_value as $key => $s) { $new_array[] = $s; } } } } print_r($new_array); ?>
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