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<?php $array = [ '46-sen1-Grid1-138', '47-sen2-Grid1-138', '50-sen5-Grid2-144', '51-sen6-Grid2-144' ]; $result = []; foreach ($array as $v) { [1 => $k, 0 => $result[$k][]] = preg_split('/-Grid\d+-/', $v); } var_export($result);
Output for git.master, git.master_jit
array ( 138 => array ( 0 => '46-sen1', 1 => '47-sen2', ), 144 => array ( 0 => '50-sen5', 1 => '51-sen6', ), )

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