我发现问题来自文件PHPExcel/Calculation.php中的库.

I find the problem come from the library in the file PHPExcel/Calculation.php.

您必须在类PHPExcel_Calculation的开头添加一行，然后添加private $saveThis;行，并在构造函数(1722行)中添加line $this->saveThis = $this;，在destruct函数(1740行)中，将remplace $this替换为$saveThis

You have to add a line at the begin of the class PHPExcel_Calculation add a line private $saveThis; and in the construct function(line 1722) add a line $this->saveThis = $this; and in the destruct function (line 1740) remplace $this by $saveThis