Upload XLS document, the value of a column is too long, read into the scientific counting method, detailed see content

Upload xls document, where the value of one column is too long, read into the scientific counting method, detailed see content
1. Upload xls
2. One of the columns is called the waybill number, the value is 22 digits, the format is as follows
Order Number Waybill Number Logistics
1 1234567890987654321234 USPS
2 1234567890987654323224 USPS
... ...
PHP Processing code:
$xls _obj=new helper_excel ();
$xls _obj->readfile ($filename);
$sheet = $xls _obj->toheadermap ();
foreach ($sheet as $key = = $row) {...}
The waybill number you read becomes a scientific notation.
This column of the Excel document has been changed to text format

Would you please give me a thought?

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------Solution--------------------
Treat him as a string, and the int type is out of bounds.

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