php - Looping through letters not working -

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i have function, loops on excel columns. working yesterday, having issues. function returning false according var_dump() isn't entering loop (i have echoed out "here" within loop , nothing echoed). why isn't working?

$max_col return correct maximum column

function get_col(phpexcel $excel, $search, $row = 5, $col = "a"){     $max_col = (string)$excel->getactivesheet()->gethighestcolumn(); // returns bh     for($i = (string)$col; $i <= $max_col; $i++){         $val    = trim($excel->getactivesheet()->getcell("{$i}{$row}")->getvalue());         $search = preg_quote($search);         if(preg_match("/$search/isu", $val)){             return "$i";         }     }     return false; }

here how calling function:

$col = get_col($excel, $sku, 5, "q"); var_dump($col);

using <= comparison strings cause problems because it's alphabetic comparison, , alphabetically "c" > "bh" adjust initial value of $max_col 1 column beyond max want check, , use !== comparison 

function get_col(phpexcel $excel, $search, $row = 5, $col = "a"){     $max_col = $excel->getactivesheet()->gethighestcolumn(); // returns bh     $max_col++;     for($i = $col; $i !== $max_col; $i++){         $val    = trim($excel->getactivesheet()->getcell("{$i}{$row}")->getvalue());         $search = preg_quote($search);         if(preg_match("/$search/isu", $val)){             return "$i";         }     }     return false; }

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