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What are the ways for php to obtain form submission? in view of this question, this article introduces in detail the corresponding analysis and answers, hoping to help more partners who want to solve this problem to find a more simple and easy way.

Php to get the form submission method: 1, the use of the predefined variable "$_ GET", you can get get data; 2, the use of the predefined variable "$_ POST", you can obtain post data; 3, the use of the predefined variable "$_ REQUEST", get or post data can be obtained.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

There are three ways for php to get form submission data:

The get method can be obtained by using the predefined variable $_ GET

The post method can be obtained by using the predefined variable $_ POST

If you don't know how the form form submits data, you can use the predefined variable $_ REQUEST to get it, and the data can be obtained in both ways.

1. Use the predefined variable $_ GET to quickly get form data (form form needs to be set to method= "get")

During the development of the program, because the data submitted by the GET method is attached to the URL and sent, the information of the type "parameters passed by the URL+ user" will be displayed in the address bar of URL, as follows:

Http://url?name1=value1&name2=value2...

Name1 and name2 are the names of the form elements (with the name attribute set for the form elements), and value1 and value2 are the values of the form elements. Use "?" between url and form elements. Separated, while multiple form elements are separated by a "&". Each form element is formatted as "name=value" and is fixed.

Let's add the form of the user.html file and look at the address bar of URL

The predefined variable $_ GET can be used directly in the user.php file to get the data. The $_ GET global variable is an associative array whose key name is the value of the form element name, and the value of the array is the value of the corresponding form. (note only if the parameters in URL can be obtained using $_ GET. )

You can use $_ GET [key name] to get the values of each form element one by one:

2. Use the predefined variable $_ POST to quickly get form data (form form needs to be set to method= "post")

The post method does not depend on URL and does not display the passed parameter values in the address bar.

In addition, the POST method can transmit data to the server without restriction, and all the submitted information is transmitted in the background, which can not be seen by the user on the browser side, so the security is relatively high. Therefore, the POST method is more suitable for sending some important information (such as credit card numbers) or comparing a large amount of data to the server.

Tip: by default, the maximum message sent by the POST method is 8MB, which can be changed later by modifying the value of post_max_size in the php.ini configuration file.

The $_ POST global variable is also an associative array. The key name of the array is the value of the form element name, and the value of the array is the value of the corresponding form. In the actual program development process, when the method attribute of the form form specifies that the data is passed in POST mode, we should use $_ POST to get the data than the form.

The $_ POST global variable is used just like a normal array, and the data can be accessed directly in the form of $_ POST ['key'], which is demonstrated by a simple example.

3. Use the predefined variable $_ REQUEST to quickly get form data

In the actual development process, what should we do when we don't know how form forms submit data? A $_ REQUEST global variable is provided in PHP, which is an array containing $_ POST, $_ GET, and $_ COOKIE. The array structure is similar to $_ POST and $_ GET.

In other words, data submitted using POST or GET can be obtained using $_ REQUEST, or even $_ REQUEST to get information about COOKIE. By introducing the request_order attribute in PHP5.3, we can control what is contained in $_ REQUEST by changing the value of the request_order property in the php.ini configuration file.

The value of the request_order attribute can be the uppercase letters G, P, and C, which represent GET, POST, and COOKIE, respectively. By default, the default value of the request_order attribute is request_order= "GP", which does not contain C, which means that $_ REQUEST does not contain COOKIE information. If we want $_ REQUEST to contain COOKIE, we need to change it to request_order= "GPC".

Example:

This is the answer to the question about php's method of obtaining form submission. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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