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PHP中$_GET方法到底有没有长度限制？

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Jun 06, 2016 pm 08:14 PM

php

今天在W3C看$_GET函数，上面写的是限制在100字符以内，然后也有看到网友说是2kb以下，另外看到一种说法是$_GET方法没有长度限制，因为它的可提交数据量与URL长度有关，而URL是没有长度限制的

请问这个方法到底有没有长度限制？有的话是多少？

回复内容：

请问这个方法到底有没有长度限制？有的话是多少？

HTTP协议从未规定GET/POST请求长度限制是多少。这个长度限制主要取决于浏览器和 web 服务器的决定和设置，各种浏览器和 web 服务器的设定均不一样。
通常webserver默认限制是8KB，不过你可以通过修改配置来更改。
浏览器这边 MSIE 和 Safari 最大值 2KB, Opera 4KB，Firefox 8KB。从应用跨浏览器的角度考虑，你应该选择最小的2KB。

我的印象中，很久以前，url的长度一般是1024字节上限，不同浏览器相差不大，不知道现在的情况了。

在http协议中，其实并没有对url长度作出限制，往往url的最大长度和用户浏览器有关，不一样的浏览器，能接受的最大长度往往是不一样的。

IE浏览器：2083个字符
Firefox浏览器：65,536个字符
Safari：80,000个字符
Opera：190,000个字符
Google：8182个字符

另外，不一样的web服务器能接受url长度也会不一样。

我最近也遇到了楼主提的这问题，场景是在在保存某些信息的时候，提交表单的方式是用GET方法，然后报错了，显示超过服务器请求限制，原因是保存的信息太多，而GET方法会把数据全部显示在URL上。把方式改为POST后，问题就不存在了，百度了一下，说是URL的长度是受浏览器的限制的，不同浏览器会有不同的长度限制

sqrtqiezi说的是对的。
无论是post还是get必然都是有长度限制的，具体由服务器和浏览器之间设定的最小值决定。
get普遍以2k为最大

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