Analysis of the difference between addslashes() and addclashes() functions in PHP

//Add backslashes to specific characters in the string
$str = "Hello, my name is John Adams.";
echo $str;
echo addcslashes($str, 'm');
echo addcslashes($str,'J');
?>

output:

//Add backslash to predefined characters in string
$str = "Who's John Adams?";
echo $str . " This is not safe in a database query .";
echo addslashes($str) . " This is safe in a database query.";
?>

output:

Who's John Adams? This is not safe in a database query. Who's John Adams? This is safe in a database query.

For the functions addslashes() and addclashes(), there are corresponding methods for removing backslashes, namely: stripcslashes function and stripslashes function. Friends who are interested can also study it.