復制代碼 代碼如下:

<?php
$var1 = 1;
function test(){
unset($GLOBALS['var1']);
}
test();
echo $var1;
?>

復制代碼 代碼如下:

<?php
$var1 = 1;
function test(){
global $var1;
unset($var1);
}
test();
echo $var1;
?>