These arrays are very special and they take effect automatically in the global scope, for example, automatically in any scope. This is often referred to as an automatic global variable (autoglobals) or a Hyper global variable (superglobals).
Copy CodeThe code is as follows:
$a = "PHP tutorial Net";
echo "takes the variable value by \ $GLOBALS:". $GLOBALS [' a '];
Output: Use $globals to take variable values: PHP tutorial Web
echo "
";
echo "filename of the current execution script:". $_server[' php_self ');
Output: File name of the current execution script:/study_php/2-3.php
echo "
";
echo "The root directory where the current execution script resides:". $_server[' Document_root ');
Output: The root directory where the current execution script resides: H:
echo "
";
echo "The absolute path of the currently executing script:". $_server[' Script_filename ');
Output: The absolute path of the current execution script: h:/study_php/2-3.php
?>
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