How to get the number of columns of worksheet as integer (28) instead of Excel-letters (“AB”)?

Question

Given:

$this->objPHPExcelReader = PHPExcel_IOFactory::createReaderForFile($this->config[\'file\']);
$this->objPHPExcelReader->setLoadSheetsOnly(a         


        

Answer 1

Not sure if your class has a built in method, but you could always use the ord() function on each letter of the column index string. You will of course have to subtract out the base value of 'A', and multiply by 26^x for each position from the far right of the string. Something like:

    $input_string = 'BC';
    $base_value = 64;
    $decimal_value = 26;
    $column_index = 0;
    for ($i = 0; $i < strlen($input_string); $i++) {
        $char_value = ord($input_string[$i]);
        $char_value -= $base_value;
        $char_value *= pow($decimal_value, (strlen($input_string) - ($i + 1)));
        $column_index += $char_value;
    }
    echo $column_index;

Basically this would make 'BC' equal (2 * 26^1) + (3 * 26^0) = 55.

$input_string being the column index string, $base_value being the ord() value of 'A' minus 1, and $decimal_value being the value of A0. Should work up to any number column. Have tested. Hope this helps.