a.php
<form action="b.php" method="GET" onsubmit="return check(this)"><input type="checkbox" name="L1agy" value="1" />是<input type="button" name="Submit" value="上一步" onclick="javascript:window.history.back();"/> <input type="submit" value="下一步" /></form>
b.php
<?php if(empty($_GET['L1agy'])){ setcookie("DATA_L1agy","0", time()+3600*24); }else{ setcookie("DATA_L1agy","1", time()+3600*24); } echo $_COOKIE['DATA_L1agy'];?> 当在a.php勾选是，然后点击下一步，将数据提交给b.php，显示“1”。
这时候点击上一步，返回将是的勾选去掉，然后再点下一步，还是会显示“1”。
再点上一步，然后再点下一步，这是才会显示“0”。
这种不同步产生的原因是什么？求解决方案。
回复讨论(解决方案)
第一次提交没有值吧。你的能显示1 ?
setcookie 之后要下次加载时才可见cookie.
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