PHP (ix) predefined array of PHP

Predefined arrays: Automatic global variables---Super global array 1. Contains data from a Web server, client, environment, and user Input 2. These arrays are particularly 3. The global scope automatically takes effect, and you can use these array 4 directly. Users cannot customize these arrays 5. Variables that can be submitted to the script directly using these array $_get//via URL requests $_post//variables submitted via HTTP POST method $_request//via Get,post and cookie mechanism submitted to script Variable, so the array is not worth our trust and use, try not to use $_files//upload via HTTP Post file to script, file upload $_cookie//Session control $_session//session Control $_en V//Execution Environment submitted to the script $GLOBALS////As long as the current script valid variables are all here, the name $_server//variable of the array key named global variable has either been set by the Web server or directly associated with the current script execution environment