<?php $array = [ 'Size: tiny', 'Size: small', 'Size: big', 'Colour: yellow', 'Colour: black', 'Colour: blue', 'Length: short', 'Length: long' ]; $result = []; foreach ($array as $v) { $result[strtok(':', $v)][] = $v; } var_export(array_values($result));
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