Magic quotes are a common question for PHPer. I accidentally saw an article today, combined with the PHP Manual and its replies, I will make a simple summary here. In short, Magic quotes will automatically escape the entered data when turned on. Among them, all single quotes (), double quotes ("), backslashes, and NULL characters will be escaped (a backslash is added). In fact, this operation essentially calls the addslashes function. Why use Magic quotes Good for beginners “I don’t have permission to close it” Why not use Magic quotes Performance issues Causing confusion PHP6 is no longer supported How to disable Magic quotes ; Magic quotes;; Magic quotes for incoming GET/POST/Cookie data.magic_quotes_gpc = Off; Magic quotes for runtime-generated data, e.g. data from SQL, from exec(), etc.magic_quotes_runtime = Off; Use Sybase- style magic quotes (escape with instead of ).magic_quotes_sybase = Off However, the online host may not allow you to modify the php.ini file, so you can use the .htaccess file to disable it and add the following code php_flag magic_quotes_gpc Off For the above portable code, the data must remain consistent whether magic_quotes is disabled or not. Then the code below can help you
Convenient and fast
The designers of PHP at the beginning of the design envisioned fast and convenient programming. For example, when inserting into a database, Magic quotes will automatically escape the data, which is very convenient.
Magic quotes can, to a certain extent, remove beginners from the security risks of scripts. For example, in code without any protection measures, after turning on Magic quotes, there will be much fewer risks, such as injection problems. Of course, using this method alone cannot completely prevent such security issues.
Obviously you may be aware of this problem, but the host space is not completely under your control.
Portability
Whether this feature is turned on or not, it will affect the portability of the script because it affects our subsequent operations of filtering the data.
All external data will be escaped before being obtained, which will undoubtedly increase runtime costs (and not all data needs to be escaped).
As mentioned above, not all data needs to be escaped. One situation that may arise is when you use the stripslashes function "crazy" to get unescaped data.
The designers of PHP have obviously realized their "mistake", so they have deprecated it in PHP6.
In my opinion, it is most reliable to use the php.ini configuration file to globally disable Magic quotes. Refer to the code below
php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PMphp把负数转为正整数的方法：1、使用abs()函数将负数转为正数，使用intval()函数对正数取整，转为正整数，语法“intval(abs($number))”；2、利用“~”位运算符将负数取反加一，语法“~$number + 1”。
php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM实现方法：1、使用“sleep(延迟秒数)”语句，可延迟执行函数若干秒；2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句，可延迟执行函数若干秒和纳秒；3、使用“time_sleep_until(time()+7)”语句。
php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PMphp除以100保留两位小数的方法：1、利用“/”运算符进行除法运算，语法“数值 / 100”；2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值，并保留两位小数。
php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM判断方法：1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式；2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的，因此真实天数需要在此基础上加1。
php字符串有没有下标Apr 24, 2022 am 11:49 AMphp字符串有下标。在PHP中，下标不仅可以应用于数组和对象，还可应用于字符串，利用字符串的下标和中括号“[]”可以访问指定索引位置的字符，并对该字符进行读写，语法“字符串名[下标值]”；字符串的下标值（索引值）只能是整数类型，起始值为0。
php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM方法：1、用“str_replace(" ","其他字符",$str)”语句，可将nbsp符替换为其他字符；2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。
php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM在php中，可以使用substr()函数来读取字符串后几个字符，只需要将该函数的第二个参数设置为负值，第三个参数省略即可；语法为“substr(字符串,-n)”，表示读取从字符串结尾处向前数第n个字符开始，直到字符串结尾的全部字符。
php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PMphp判断有没有小数点的方法：1、使用“strpos(数字字符串,'.')”语法，如果返回小数点在字符串中第一次出现的位置，则有小数点；2、使用“strrpos(数字字符串,'.')”语句，如果返回小数点在字符串中最后一次出现的位置，则有。
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