我似乎无法在PHP的MySQL数据库中插入一个像“\”这样的特殊字符？

I cant seem to insert a special character like “\” in a MySQL database

here's my code

<?php
  $insert_data = mysqli_query($con, "INSERT INTO table_name (id, img) VALUES('', '<img title="\sum" src="http://latex.codecogs.com/gif.latex?\sum" data-mce-src="http://latex.codecogs.com/gif.latex?\sum" data-mce-selected="1">')");
?>

You need to escape the " in your query.

Since you are using PHP, you need to escape backslash (\) with another backslash like this \\ inside a string

<?php
$insert_data = mysqli_query($con, "INSERT INTO table_name (id, img) VALUES('', '<img title="\\sum" src="http://latex.codecogs.com/gif.latex?\\sum" data-mce-src="http://latex.codecogs.com/gif.latex?\\sum" data-mce-selected="1">')");
?>