Potential security risks of array_walk

Array_walk function prototype: array_walk (array, function, userdata...), which can be viewed as follows:

Http://www.bkjia.com/shouce/w3school/php/func_array_walk.asp.html

Note:

1. The first parameter of the function must be an array. If it is not possible, the absolute path is cracked.

2. If the callback function needs to act directly on the value in the array, you can specify the first parameter of the callback function as reference: & $ value.

<? Php $ a = '11aaa'; array_walk ($ a, "intval"); $ SQL = $ a; balabal ....

The above code may contain sqli.