PHP reports an error: classes\phpexcel\cell php Line(594) Invalid cell coordinate ESIGN1

One 、 explain

Invalid cell coordinate ESIGN1： Cell coordinates ESIGN1 Invalid

• At first, I was a little confused when I saw this problem , Only step by step echo 1;die(); Print , Finally found the problem , Four or five cells E, It was written as ESIGN1. Maybe I copied a word before SIGN1 stay E Back , Embarrassed ~

• hold ESIGN1 Change to E That's it

• Code screenshot

Two 、 Content

1、 Before the change

    /** * @param int $count  The number of columns  * @return array  One dimensional array of column names  */
    public static function getCol($count)
    {
    
        $columnFlag = [
            0 => 'Z', 1 => 'A', 2 => 'B', 3 => 'C', 4 => 'D', 5 => 'ESIGN1', 6 => 'F', 7 => 'G', 8 => 'H',
            9 => 'I', 10 => 'J', 11 => 'K', 12 => 'L', 13 => 'M', 14 => 'N', 15 => 'O', 16 => 'P', 17 => 'Q',
            18 => 'R', 19 => 'S', 20 => 'T', 21 => 'U', 22 => 'V', 23 => 'W', 24 => 'X', 25 => 'Y', 26 => 'Z'
        ];

        if ($count == 0) {
    
            return [];
        }

        $column = [];
        for ($index = 1; $index <= $count; $index++) {
    
            if ($index <= 26) {
    
                $column[] = $columnFlag[$index];
            } else {
    
                $value = floor($index / 26);
                if ($index % 26 == 0) {
    
                    $value -= 1;
                }
                $column[] = $columnFlag[$value] . $columnFlag[floor($index % 26)];
            }
        }
        return $column;
    }

2、 After modification

    // test 
    public function test()
    {
    
        var_export(self::getCol(99));
    }

    /** * @param int $count  The number of columns  * @return array  One dimensional array of column names  */
    public static function getCol($count)
    {
    
        $columnFlag = [
            0 => 'Z', 1 => 'A', 2 => 'B', 3 => 'C', 4 => 'D', 5 => 'E', 6 => 'F', 7 => 'G', 8 => 'H',
            9 => 'I', 10 => 'J', 11 => 'K', 12 => 'L', 13 => 'M', 14 => 'N', 15 => 'O', 16 => 'P', 17 => 'Q',
            18 => 'R', 19 => 'S', 20 => 'T', 21 => 'U', 22 => 'V', 23 => 'W', 24 => 'X', 25 => 'Y', 26 => 'Z'
        ];

        if ($count == 0) {
    
            return [];
        }

        $column = [];
        for ($index = 1; $index <= $count; $index++) {
    
            if ($index <= 26) {
    
                $column[] = $columnFlag[$index];
            } else {
    
                $value = floor($index / 26);
                if ($index % 26 == 0) {
    
                    $value -= 1;
                }
                $column[] = $columnFlag[$value] . $columnFlag[floor($index % 26)];
            }
        }
        return $column;
    }