復制代碼 代碼如下:

<?php
// 例子1
function test_global() {
global $var1, $var2;
$var2 =& $var1;
}
function test_globals() {
$GLOBALS['var3'] =& $GLOBALS['var1'];
}
$var1 = 5;
$var2 = $var3 = 0;
test_global();
print $var2 .”/n”;
test_globals();
print $var3 .”/n”;
?>

復制代碼 代碼如下:

<?php
// 例子2
function test() {
global $a;
unset($a);
}
$a = 1;
test();
print $a;
?>

復制代碼 代碼如下:

<?php
function myfunction(){
global $bar;
unset($bar);
}
$bar=”someting”;
myfunction();
echo $bar;
?>

復制代碼 代碼如下:

<?php
function foo()
{
unset($GLOBALS['bar']);
}
$bar = “something”;
foo();
echo $bar;
?>

復制代碼 代碼如下:

<?php
$a = 1;
$b = 2;
function Sum()
{
global $a, $b;
$b = $a + $b;
}
Sum();
echo $b;
?>