笔记 php.ini配置文件中magic
默认情况下，PHP 指令 magic_quotes_gpc 为 on，对所有的 GET、POST 和 COOKIE 数据自动运行 addslashes()。不要对已经被 magic_quotes_gpc 转义过的字符串使用 addslashes()，因为这样会导致双层转义。遇到这种情况时可以使用函数 get_magic_quotes_gpc()
默认情况下，PHP 指令 magic_quotes_gpc 为 on，对所有的 GET、POST 和 COOKIE 数据自动运行 addslashes()。不要对已经被 magic_quotes_gpc 转义过的字符串使用 addslashes()，因为这样会导致双层转义。遇到这种情况时可以使用函数 get_magic_quotes_gpc() 进行检测。
PHP magic_quotes_gpc=on的情况:我们可以不对输入和输出数据库的字符串数据作addslashes()和stripslashes()的操作,数据也会正常显示。
你对输入的数据作了addslashes()处理，那么在输出的时候就必须使用stripslashes()去掉多余的反斜杠。
PHP magic_quotes_gpc=off的情况:使用addslashes()对输入数据进行处理，但并不需要使用stripslashes()格式化输出，因为addslashes()并未将反斜杠一起写入数据库，只是帮助mysql完成了sql语句的执行。
magic_quotes_runtime 转义字符:当你的数据中有一些 \ ” ‘ 这样的字符要写入到数据库里面，又想不被过滤掉的时候，它就很有用，会在这些字符前加上\
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