PHP中函数内引用全局变量的方法

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/>';?>

输出的结果如下：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。