PHPSpreadsheet - 无法更新现有的电子表格，但可以写入新的电子表格？

Question

所以我使用PHPSpreadsheet写入现有的电子表格但由于某种原因我不断收到此错误：

PHP Fatal error:  Uncaught Error: Call to a member function setValue() on null in /home/joe/vendor/phpoffice/phpspreadsheet/samples/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php:1127
Stack trace:
#0 /home/joe/vendor/phpoffice/phpspreadsheet/samples/server.php(90): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet->setCellValue('b15', '6429093')
#1 {main}
  thrown in /home/joe/vendor/phpoffice/phpspreadsheet/samples/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php on line 1127

我只是在尝试从现有电子表格加载时遇到此错误，而不是从新电子表格加载时。代码如下：

$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$letters = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','aa','ab','ac','ad','ae','af','ag','ah','ai','aj','ak','al','am','an','ao','ap','aq','ar','as','at','au','av','aw','ax','ay','az','ba','bb','bc','bd','be'];

    $numColumns = count($letters);

    foreach($rows as $row) {

        foreach($row as $key => $value) {

            if(isset($value) && $value != null) {

                $sheet->setCellValue($letters[$key].$i, $value);
            }

            //print_r();
        }

        $i++;
    }

我正在加载的电子表格只包含一堆单元格格式和一些已有数据的单元格。您可以提供的任何帮助都很棒:-)

Answer 1

字母应该是大写字母，而不是小写字母，这个方法是通过ascii代码获取char。并将其转换为使用函数chr获取它的char。

ascii code。 chr php function

$letters = range(65, 90) // A-Z ascii code

foreach($rows as $i => $row) {

   foreach($row as $j => $value) {

     if(isset($value) && $value != null) {

        // array start from 0, but spreadsheet line start from 1. then $i+1  
        $sheet->setCellValue( chr($letters[$j]).($i+1) , $value); // A1, $value
     }

     //print_r();
   }
 }