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　　 The addcslashes() function is used to escape characters in a string using C language style backslashes

string addcslashes ( string $str , string $charlist )

Returns a string that adds a backslash before each character that belongs to the parameter charlist list.

It returns the escaped string

Serial Number	Parameters and Descriptions
1	str String to be escaped
2	charlist If charlist contains characters such as \n, \r, etc., they will be converted in C language style, while other non-alphanumeric characters and ASCII codes below 32 and above 126 All characters are converted to octal representation. When defining the character sequence in the charlist parameter, it is necessary to indeed know what characters are between the start and end range that you have set.

Try the following example

Example

<?php
　　　　echo addcslashes("zoo['.']", 'z..A');
//　Output: \zoo['\.']
?>

Output Result:

\zoo['\.']