SQL statement error of common bug caused by Excel cell content that is not paid attention to for a long time

bug------ Strange index value generation （ Solution ：addslashes）

Preface ：bug------ Strange index value generation （ Solution ：addslashes）
When the code is running BUG
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘04643945’’ at line 1
error SQL：select * from book where 1=1 and book_id=’‘04643945’

Here are some Inline code slice .

//  Display the error code 
 $result = 'select * from book where 1=1 and book_id=\'' .$datahtml[$i]['nuid'] .'\'';
 
//  Show corrections 
 $result = 'select * from book where 1=1 and book_id=\'' .addslashes($datahtml[$i]['nuid']) .'\'';

From the above code, we can see that we have added one more PHP function ：
The action point of the function can be linked .（https://www.w3school.com.cn/php/func_string_addslashes.asp）
addslashes() Function returns a string with a backslash before a predefined character .

The reason for the error ：’‘04643945’
Cause of error ： When EXCEL When the number in is text , When importing or copying select all , With single quotation marks on it