//向字符串中的特定字符添加反斜杠$str = "Hello, my name is John Adams.";echo $str;echo addcslashes($str,'m');echo addcslashes($str,'J');?>复制代码输出：//向字符串中的预定义字符添加反斜杠$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.";?>复制代码输出：Who's John Adams? This is not safe in a database query.
Who\'s John Adams? This is safe in a database query.对于函数addslashes()和addclashes()，都有对应的去除反斜杠的方法，分别为：stripcslashes函数和stripslashes函数。有兴趣的朋友，也可以研究下。