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!声明函数时,函数名前面带个&是什么意思?

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2016-06-13 12:30:511807browse

求助!声明函数时,函数名前面带个&是什么意思???

本帖最后由 zx11307 于 2013-12-24 17:57:24 编辑 如题所述:
例如
<br />
function &ret_ref(){<br />
$var="php";<br />
return $var;<br />
}<br />
$v=&ret_ref();

函数前面带&和不带&有什么区别么?为什么要加个&
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