What is the difference between post and get in php?

The difference between post and get in php: 1. GET obtains data from the server, while POST transmits data to the server; 2. The amount of data transmitted by GET is small and cannot be larger than 2KB, while POST transmits The amount of data is large and is generally unrestricted by default; 3. GET security is very low, while POST security is high.

The difference between post and get in php:

1. GET is to get data from the server, POST is Send data to the server.

2. GET adds the parameter data queue to the URL pointed to by the ACTION attribute of the submitted form. The values ​​correspond 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.

3. For GET method to submit form data, the server side uses $_GET['name'] to obtain the value of the variable. For POST method to submit form data, the server side uses $ _POST['name']Get the submitted data, of course, both can get the form data through $_REQUEST['name']. For submitting form data in the REQUEST method, 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, and 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, <form method="get" action= "a.asp?b=b"> is the same as <form method="get"action="a.asp">, that is to say, in this case Below, the GET method will ignore the parameter list at the end of the action page.

The POST form value can be obtained through _POST; but the parameters set through the url parameter of the action cannot be obtained through _POST. action=test.php?id=1This is the GET method to transfer values. You can use $_REQUEST and $_GET to accept the value, but you cannot use POST. method to obtain the value, even if the form is submitted via POST.

When submitting a form, if there are parameters in the action, it is best to only use the POST form method. For the data in the form, it is obtained directly through POST. For the parameters in the action, it is obtained through GET.

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