superglobals超全局变量之$GLOBALS, $_GET, $_POST, $_FILES, $_REQUEST, $_SESSION 等

/*****************by garcon1986********************/

<?php

//$GLOBALS — References all variables available in global scope
function test(){
$x = 'local x';
echo "global scope ".$GLOBALS['x']."<br />";
echo "local scope $x <br />";
}
$x = 'global x';
test();
//Note: This is a 'superglobal', or automatic global, variable.
//This simply means that it is available in all scopes throughout a script.
//There is no need to do global $variable; to access it within functions or methods.


//$_GET -- $HTTP_GET_VARS[deprecated] - HTTP GET variables
//test url: http://localhost/aptana/php5/superglobal-get.php?id=1&name=sun
echo htmlspecialchars($_GET['name']).'<br />';
echo htmlspecialchars($_GET['id']);

//$_POST -- $HTTP_POST_VARS [deprecated] — HTTP POST variables

//$_FILES -- $HTTP_POST_FILES [deprecated] — HTTP File Upload variables

//$_REQUEST — HTTP Request variables

//$_SESSION -- $HTTP_SESSION_VARS [deprecated] — Session variables

//$_ENV -- $HTTP_ENV_VARS [deprecated] — Environment variables
echo 'My username is ' .$_ENV["USER"] . '!';
echo '<br />';

//$_COOKIE -- $HTTP_COOKIE_VARS [deprecated] — HTTP Cookies

//$php_errormsg — The previous error message
@strpos();
echo $php_errormsg;
echo '<br />';

//$HTTP_RAW_POST_DATA — Raw POST data

//$http_response_header — HTTP response headers
file_get_contents("http://php.net");
var_dump($http_response_header);
echo '<br />';

//$argc — The number of arguments passed to script
var_dump($argc);
echo '<br />';

//$argv — Array of arguments passed to script
var_dump($argv);
echo '<br />';

?>