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 '#####'