加个隐藏域hidden,用事件触发值赋给它
<input type="hidden" value="" name="name2">,<input type="image" src="url" name="name" onclick="javascript:document.forms[0].name2.value='1234';document.forms[0].submit();">
<input type="hidden" value="" name="name2">,<input type="image" src="url" name="name" onclick="javascript:document.forms[0].name2.value='1234';document.forms[0].submit();">
改成
if($_POST["name_x"]&&$_POST["name_y"])