When PHP accepts information submitted through an HTML form, it saves the submitted data in a global array, and we can call the system-specific array of automatic global variables to get those values. The usual automatic global variables are as follows:
1.GET Mode
Function: Get data submitted by get mode
Format: $_get["FormElement"]
2.POST Mode
Function: Get the data submitted by post mode
Format: $_post["FormElement"]
3.REQUEST method
Function: Get data submitted in any way, $_request automatic global variable contains all get, POST, cookie and file data, such as not concerned about the source of data.
Format: $_request["FormElement"]
check box, list box (name in array form such as: "select[]", when the value is obtained directly using $_post["select")
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