What are the characteristics of get and post in php

The differences and characteristics of GET and POST in php are as follows:

1. GET is to obtain data from the server, and POST is to send data to the server Transfer data.

2. GET adds the parameter data queue to the URL pointed to by the ACTION attribute of the submitted form. The value corresponds to each field in the form one-to-one and can be seen in the URL. POST uses the HTTP POST mechanism to place each field in the form and its content in the HTML HEADER and transmit it to the URL address pointed to by the ACTION attribute. Users cannot see this process.

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3. For GET method submission of form data, the server uses $_GET['name'] to obtain the value of the variable. For Submit form data via POST, and the server uses $_POST['name'] to obtain the submitted data. Of course, both can obtain form data through $_REQUEST['name']. For submitting form data in REQUEST mode, the server uses $_REQUEST[‘name’] to obtain the value of the variable, but this method is rarely used.

4. The amount of data transmitted by GET is small and cannot be larger than 2KB. The amount of data transmitted by POST is large and is generally unrestricted by default. But in theory, it is generally believed that it cannot exceed 100KB.

5. GET security is very low, POST security is high.

6. The GET form value can be obtained through _GET; but the parameters set through the action URL cannot always be obtained,

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, that is to say, in this case, the GET method will ignore the parameter list following the action page. The POST form value can be obtained through _POST; but the parameters set through the url parameter of the action may not be obtained through _POST. action=test.php?id=1 is the GET method to pass the value. You can use $_REQUEST and $_GET to accept the value, but you cannot use the POST method to obtain the value, even if the form is submitted in the POST method. When submitting a form, if there are parameters in the action, it is best to use the POST form method. For the data in the form, obtain it directly through POST. For the parameters in the action, obtain it through GET.

When doing data query, it is recommended to use the GET method, and when doing data addition, modification or deletion, it is recommended to use the POST method.

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