In PHP, $ _ Request, $ _ post, and $ _ Get are used to accept form data. What are the differences between them and when to use the best form data. I. Differences and features between $ _ Request and $ _ post and $ _ get $ _ request [] use the $ _ post [] $ _ Get [] function, however, $ _ request [] is slow. You can use the $ _ Request array to obtain the differences and features of $ _ post and $ _ get. get gets data from the server, and post transfers data to the server. 2. Get is to add the parameter data queue to the URL referred to by the Action attribute of the submission form. The values correspond to each field in the form one by one and can be seen in the URL. Post uses the http post mechanism to place fields in the form and their content in the HTML header and send them to the URL address referred to by the Action attribute. You cannot see this process. 3. For the get method, the server uses request. querystring to obtain the value of the variable. For the POST method, the server uses request. Form to obtain the submitted data. 4. The data volume transmitted by get is small and cannot exceed 2 kb. The amount of data transmitted by post is large, which is generally not restricted by default. Theoretically, the maximum size of IIS4 is 80 KB, and that of iis5 is 100kb. 5. Low get security and high post security. Example: mypage? Id = 1: This is the get Method for passing values. You can use $ _ Request and $ _ get to receive values.