What is a URI

When it comes to URI, many people will think of uri. Many people always confuse url and URI. Let's explain what URI is.

1: What is URI

URI refers to the Uniform Resource Identifier and identifies a string on the Internet. The available resources are located by resource identifiers, and users access specific resources through the identifiers.

URI has the function of identifying and locating resource strings on the web, such as images, html and other programs, which are all located by a string.

2: Components of URI

URI is composed of three parts, mainly the resource identifier and host name and relative URI.

1. Host name:

The host name is represented by a path, which generally refers to the name of the resource, for example: http://php.cn/a/b

It means that on the php host, the URI string is used to access the folder in a on the host, and b requires access to the /a/b file on the host.

2. Identifier:

Under normal circumstances, some URIs point to the inside and must end with "#", followed by anchor.

3. Relative URI

Relative URI has no specification information and refers to the same resource on the host. A relative URI may contain a fragment identifier and a relative path.

3: What is URI used for?

In HTML, URI can do many things. It is mainly used to link to another document. It can also link to another style sheet or script. , creating forms, and referencing external links can all be achieved using URIs.

The above is the complete introduction to learning what URI is. If you want to know more about operation and maintenance, please pay attention to the php Chinese website.

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