addslashes() 例子：
<?php $str = "Who‘s John Adams?"; echo $str . " This is not safe in a database query.<br />"; echo addslashes($str) . " This is safe in a database query."; ?>
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.
stripslashes() 例子：
<?php echo stripslashes("Who\‘s John Adams?"); ?>
输出：
Who‘s John Adams?
PHP关于反斜杠处理函数addslashes()和stripslashes()的用法
原文：http://www.cnblogs.com/xcxc/p/4259353.html