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<?php $array = ['45', '21', '45', '45', '45', '29', '35', '35', '21']; $result = []; $last = null; foreach ($array as $v) { if ($last !== $v) { unset($ref); $result[] =& $ref; } $ref[] = $v; $last = $v; } var_export($result);
Output for git.master, git.master_jit
array ( 0 => array ( 0 => '45', ), 1 => array ( 0 => '21', ), 2 => array ( 0 => '45', 1 => '45', 2 => '45', ), 3 => array ( 0 => '29', ), 4 => array ( 0 => '35', 1 => '35', ), 5 => array ( 0 => '21', ), )

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