This feature has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0.
当打开时,所有的 '(单引号),"(双引号),\(反斜线)和 NULL 字符都会被自动加上一个反斜线进行转义。这和 addslashes() 作用完全相同。
一共有三个魔术引号指令: