php 报 Not Found The requested URL /index.php was not found on this server.怎么办?

 Not Found The requested URL /index.php was not found on this server.

看提示是URL地址错误。原因是没有设置服务器地址重写，或者是设置了.htaccess文件，但没有打开重写功能。

解决办法是增加一个.htaccess文件，里面加上重写规则

RewriteEngine On

# The RewriteBase / instruction is commented. Remove the "#" to uncomment
# RewriteBase /

# Memory Limit
# php_value memory_limit 256M
# php_value max_execution_time 18000

# Disable Hotlinking
# Replace "domain.tld" with your domain name
# Don't forget to add a picture "thepic.gif" on your server 
# RewriteCond %{HTTP_REFERER} !^http://(.+\.)?domain\.tld/ [NC]
# RewriteCond %{HTTP_REFERER} !^$
# Solution 1 : Displays another picture from an URL
# RewriteRule .*\.(jpe?g|gif|bmp|png)$ http://www.domain.tld/thepic.gif [L]
# Solution 2 : Displays a 403 forbidden
# RewriteRule .*\.(jpe?g|gif|bmp|png)$ - [F]

# Forces the "www"
# RewriteCond %{HTTP_HOST} !^www\.yourdomain\.tld$ [NC]
# RewriteRule ^(.*)$ http://www.yourdomain.tld/$1 [QSA,L,R=301]

# Uncomment these lines to display the off.html page to other IP than the one bellow
# RewriteCond %{REMOTE_ADDR} !^127.0.0.1$
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteRule ^(.*) off.html

# DO NOT MODIFY ANY FOLLOWING LINE

# Iemis Rules
# Keep these lines even in maintenance mode, to have an access to the website
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|robots\.txt)
RewriteRule ^(.*)$ index.php?/$1
#RewriteCond %{HTTP_HOST} !^(www)\. [NC]
#RewriteRule ^(.*)$ index.php/$1 [L,QSA]
#RewriteRule ^(.*)$ index.php/$1 [L,P]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(application|modules|plugins|system|themes) index.php?/$1 [L]

.htaccess文件中index.php后面加了？ 

如若不行就把？去掉试试！