/* the result of print_r($_POST['select']); : Array ( [7_222] => 5 [7_333] => 4 [7_444] => 5 [8_222] => 3 [8_333] => 5 [8_444] => 2 [9_222] => 5 [9_333] => 3 [9_444] => 1 )*/ foreach($_POST['select'] as $k => $v) { $k=explode('_',$k); $row=$k[0]; $column=$k[1]; $matrix[$row][$column]=$v; } $cb = count($matrix); $ck = isset($matrix[$row])?count($matrix[$column]):0; for($row1=0;$row1$matrix[$row2][$column]) { $k[]='k'.($column+1); } } echo implode(',',$k).'
'; } } }
Notice: Undefined offset: 0 in C:
how to solve this problem?