php - Questions about Apache rewrite

Question

When learning the Rewrite function of Apache. I don’t know what the L in flags does
For example, the following code:

RewriteRule ^(.*)    first.php?key= [L]
RewriteRule ^(.*)    second.php?key= 

Since you don’t want to execute the following code, wouldn’t you just comment and delete it directly? Why do you have to use L

Answer 1

Judging from your configuration file, the latter sentence is indeed unnecessary. But this is only limited to the configuration example you gave. It doesn’t mean that L没用，L still has its own application scenarios

Hypothesis

RewriteRule /([0-9]+).html /test1.php?id=
RewriteRule /(.*) /test2.php?id=

In this configuration, my request is 123.html, then when the request reaches apache, apache will start matching rules from top to bottom:
The first step, match RewriteRule /([0-9]+). html /test1.php?id=$1, found that the match passed, because there is no mark to stop, so continue to execute the code RewriteRule /([0-9]+).html /test1.php?id=, 发现匹配通过, 因为没有标记停止，所以继续向下执行代码
第二步，匹配RewriteRule /(.*) /test2.php?id=, 发现匹配通过，因为是最后一条规则，且是通过的规则，则最终请求被导向test2.php?id=123.htmlThe second step, match RewriteRule /(.*) /test2.php?id =$1, it is found that the match is passed, because it is the last rule and it is a passed rule, then the final request is directed to the page of test2.php?id=123.html

But if so:

RewriteRule /([0-9]+).html /test1.php?id= [L]
RewriteRule /(.*) /test2.php?id=

After the first match passed, a mark was foundL，则apache停止向下继续匹配，而是直接就导向了test1.php?id=123的页面; 而其他的请求（比如:abc.html）只有当第一条规则不通过的时候，才会继续匹配第二条规则, 请求被导向至test2.php?id=abc.html