php 获取 radio多选项值代码

php 获取 radio多选项值代码:

<form method=get> 
	<input type="radio" name="sex" id="sex1" value="1" /><label for="sex1">男朋友</label> 
	    <input name="sex" id="sex2" type="radio" value="2" checked="checked" /><label for="sex2">女朋友</label> 
	    <input name="sex" type="radio" id="sex3" value="" checked="checked" /><label for="sex3">不限</label>   
	<input name="提交" type="submit" /> 
	</form> 
	<? 
	if( $_GET ) 
	{ 
	 echo $_GET[&#39;sex&#39;] ; 
	}