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<?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));
Output for git.master, git.master_jit
array ( 0 => array ( 0 => 'Size: tiny', 1 => 'Size: small', 2 => 'Size: big', 3 => 'Colour: yellow', 4 => 'Colour: black', 5 => 'Colour: blue', 6 => 'Length: short', 7 => 'Length: long', ), )

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