(3.20) Pre-defined arrays

<?php/* Predefined Arrays: * Auto global variable---Hyper global array * * 1. Contains data from the Web server, client, run environment, and user input * 2. These arrays are very special * 3. The global scope automatically takes effect, all of which can be directly used by the array * 4. Users cannot customize these arrays, but they operate in the same way as array operations that they define themselves * 5. These arrays can be used directly in the function * * $_get//variables submitted to the script via URL request * $_post////The variables submitted to the script via the HTTP POST method * $_ Request//Variable submitted to script via get, post and COOKIE mechanism * $_files//variable submitted to script via HTTP POST method file Upload * $_cookie* $_session* $_env//Execution Environment commit to script variable * $_server//variables are set by the Web server, or directly associated with the execution environment of the current script * $GLOBALS//As long as the current script is valid variables are here, the array's key name is the name of the global script ***///the Super Global array can be called directly inside the function $arr= Array (10,20);//General Array $_get=array (50,90);//Hyper Global Array function demo () {global $arr;//Call global variable to first include Print_r ($arr);p Rint_r ($_get )///Direct call to a hyper-global array without}?><!--********** page value GET request ***************--><?php//directly to the worth variable, Useful when register_global=on in php.ini configuration files. echo $username. " <br> "; Echo $email." <br> "; Echo $page." <br> ";//The most stable method of value echo $_get[" username "]." <br> "; Echo $_get[" email "]." <br> "; Echo $_get[" page "]." <br> ";? ><a href= "demo.php?username=zhangsan&[email protected]&page=45" >this is a $_GET test</a><!--*********** Page pass-through POST request ****************--><form action= "demo.php" method= "POST" >username:< Input type= "text" name= "uname"/> <br/>password:<input type= "password" name= "pass"/> <br/>< Input type= "submit" value= "Login"/> <br/></form><?phpprint_r ($_get);//cannot receive Print_r ($_post);// In order to receive the use of the ><?php//$_env echo ' <pre> ';p rint_r ($_env), echo ' </pre> ';//Display the current environment//can also be a single traversal? ><? php//uses a $globals super-global array to call the global variable $a=100 within the function, $b =200, $c =300;function Demo () {//Call the global variable directly echo $GLOBALS ["a"]. " <br> "; Echo $GLOABLS [" B "]." <br> "; Echo $GLOABLS [" C "]." <br> ";}?  >

(3.20) (go) predefined arrays