essue

VALUES('$this->image_id','file_get_contents($tmp_image)')";

This code builds a string in PHP, but the function call file_get_contents($tmp_image) is not evaluated before the string is created.因此，未插入实际的二进制数据。

解决方案1 ​​

要解决这个问题，您需要明确地将函数的结果与函数呼叫：

VALUES('$this->image_id','" . file_get_contents($tmp_image) . "')";

Solution 2

Additionally, ensure that any characters in the binary data that might interfere with the query被逃脱了：