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<?php $arr=array( Array ( 0 => 3, 1 => 1 ), Array ( 0 => 3, 1 => 2 ), Array ( 0 => 3, 1 => 128 ), Array ( 0 => 39, 1 => 4 )); $col0 = array_unique(array_column($arr, 0)); Foreach($col0 as $val){ // $res[] = [$val, Var_dump(array_sum(array_intersect_key($arr, array_intersect($col0, [$val])))); } Var_dump($res);
Output for git.master_jit, git.master
int(0) int(0) Warning: Undefined variable $res in /in/OAJfJ on line 31 NULL
Output for rfc.property-hooks
Warning: array_sum(): Addition is not supported on type array in /in/OAJfJ on line 29 int(0) Warning: array_sum(): Addition is not supported on type array in /in/OAJfJ on line 29 int(0) Warning: Undefined variable $res in /in/OAJfJ on line 31 NULL

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