先看下面的代码：
<?php
$var1 = "#####";
$var2 = "&&&&&";
function global_references($use_globals)
{
global $var1, $var2;
if (!$use_globals) {
$var2 =&$var1; //1
} else {
$GLOBALS["var2"] =&$var1; //2
}
}
global_references(false);
echo "var2 is set to '$var2'<br/>";
global_references(true);
echo "var2 is set to '$var2'<br/>";
?>
var2 is set to '&&&&&'
var2 is set to '#####'
可见，上面的代码中：
$var2 =&$var1; //1
只对函数内部可见。
而
$GLOBALS["var2"] =&$var1; //2
在全局范围内可见。