A brief introduction to .htaccess files_PHP tutorial

.htaccess file (or "distributed configuration file") provides a method to change the configuration for a directory, that is, placing a file containing one or more directives in a specific document directory to act on this directory and all subdirectories. As a user, the commands that can be used are restricted by the administrator through the Apache AllowOverride directive.

Directives in subdirectories will override directives in higher-level directories or main server configuration files.
.htaccess must be uploaded in ASCII mode, and it is best to set its permissions to 644.

Unix, Linux systems or any version of the Apache web server support .htaccess, but some hosting service providers may not allow you to customize your own .htaccess file. Most domestic virtual hosts do not have this function. The one I know that provides this function is Kangsheng Century (the forum service provider of Discuz).

To enable .htaccess, you need to modify httpd.conf, enable AllowOverride, and use AllowOverride to limit the use of specific commands. If you need to use a file name other than .htaccess, you can use the AccessFileName directive to change it. For example, if you need to use .config, you can configure it in the server configuration file as follows: AccessFileName .config.

Generally speaking, .htaccess can help us achieve: folder password protection, automatic user redirection, customized error pages, change your file extension, ban users with specific IP addresses, and only allow specific IP addresses. Some functions include users, prohibited directory lists, and using other files as index files.

How to create a .htaccess document

.htaccess is a weird file name (from a Win perspective, it has no file name, only an 8-letter extension, but in fact it is a naming under Linux, and many under Linux Things that we always think are weird) cannot be created directly through "New" file in Win system, but we can use copy in cmd to achieve it, such as copy sample.txt .htaccess. You can also create an htaccess.txt first, then Ftp to the server and modify the file name through FTP.

How to customize error page

One application of

.htaccess is custom error pages, which will allow you to have your own, personalized error page (for example when a file is not found), rather than the error page provided by your service provider or without any page. This will make your website look more professional when something goes wrong. You can also use scripts to notify you when errors occur (for example, automatically email you when a page cannot be found). Any page error code you know (such as 404 Page Not Found) can be turned into a custom page by adding the following text to the .htaccess file:

One application of

.htaccess is custom error pages, which will allow you to have your own, personalized error page (for example when a file is not found), rather than the error page provided by your service provider or without any page. This will make your website look more professional when something goes wrong. You can also use scripts to notify you when an error occurs (for example, automatically email you when a page cannot be found). Any page error code you know (such as 404 page not found) can be turned into a custom page by adding the following text to the .htaccess file:

ErrorDocument errornumber /file.html

For example, if there is a notfound.html file in my root directory, I want to use it as the 404 error page: ErrorDocument 404 /notfound.html

If the file is not in the root directory of the website, you only need to set the path to: ErrorDocument 500 /errorpages/500.html

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