代码：
复制代码 代码示例:
<?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/>";
?>
输出结果：
var2 is set to &&&&&
var2 is set to #####
以上代码中：
$var2 =&$var1; //1
只对函数内部可见。
在：
$GLOBALS["var2"] =&$var1; //2
则是全局范围内可见。
