Usage of QUERY_STRING and REQUEST_URI in php $ _ SERVER

The use of QUERY_STRING and REQUEST_URI in php $ _ SERVER often uses the $ _ SERVER function in the process of writing a program. sometimes, variables that are not familiar with will cause a great misunderstanding, today I have found several small examples to illustrate the usage of the four variables that are commonly used.

$ _ SERVER stores information about the current SERVER, which has the following values:

$ _ SERVER ["QUERY_STRING"];

$ _ SERVER ["REQUEST_URI"];

$ _ SERVER ["SCRIPT_NAME"],

$ _ SERVER ["PHP_SELF"];

The following describes the differences between QUERY_STRING, REQUEST_URI, SCRIPT_NAME, and PHP_SELF variables in the $ _ SERVER function, it is convenient to obtain the required values in practical applications for your reference.

1, $ _ SERVER ["QUERY_STRING"]

Description: query string

2, $ _ SERVER ["REQUEST_URI"]

Description: the URI required to access this page

3, $ _ SERVER ["SCRIPT_NAME"]

Description: path containing the current script

4, $ _ SERVER ["PHP_SELF"]

Description: file name of the script being executed

Instance 1, the code is as follows:

$ _ SERVER ["QUERY_STRING"] = ""

$ _ SERVER ["REQUEST_URI"] = "/"

$ _ SERVER ["SCRIPT_NAME"] = "/index. php"

$ _ SERVER ["PHP_SELF"] = "/index. php"

Instance 2, the code is as follows:

$ _ SERVER ["QUERY_STRING"] = "tags/upload ″

$ _ SERVER ["REQUEST_URI"] = "/? Tags/upload ″

$ _ SERVER ["SCRIPT_NAME"] = "/index. php"

$ _ SERVER ["PHP_SELF"] = "/index. php"

Instance 3, the code is as follows:

$ _ SERVER ["QUERY_STRING"] = "tags/upload/2"

$ _ SERVER ["REQUEST_URI"] = "/index. php? Tags/upload/2"

$ _ SERVER ["SCRIPT_NAME"] = "/index. php"

$ _ SERVER ["PHP_SELF"] = "/index. php"

$ _ SERVER ["QUERY_STRING"]: obtain the query statement. Which of the following statements can be obtained in the instance? Value after

$ _ SERVER ["REQUEST_URI"] gets the value after the http://www.phpfensi.com, including/

$ _ SERVER ["SCRIPT_NAME"] obtains the path of the current script, for example, index. php.

$ _ SERVER ["PHP_SELF"] file name of the script currently being executed

To sum up, for QUERY_STRING, REQUEST_URI, SCRIPT_NAME, and PHP_SELF, an in-depth understanding will help us call these four values correctly in the $ _ SERVER function. the QUERY_STRING function in the $ _ SERVER function is explained through an instance, REQUEST_URI, SCRIPT_NAME, and PHP_SELF determine the differences between the four variables.