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session_start()怎么使用

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2016-06-13 12:33:59986browse

session_start()如何使用?

本帖最后由 xwmr1988 于 2013-11-05 16:07:59 编辑 php.ini中session.auto_start=0
页面一index.php:
<br />
<?php session_start();?><br />
<?php<br />
	if(isset($_POST['submit'])){<br />
		$_SESSION['season']=$_POST['season'];<br />
		header('Location:test.php');<br />
	}<br />
?><br />
<b>存储会话</b><br />
<hr /><br />
选择需要设置的数据:<br />
<form id="form1" name="form1" action="index.php" method="post"><br />
<select name="season" id="season"><br />
	<option value="空">  </option><br />
	<option value="春天">春天</option><br />
	<option value="夏天">夏天</option><br />
    <option value="秋天">秋天</option><br />
    <option value="冬天">冬天</option><br />
</select><br />
<br /><br /><br />
<input type="submit" name="submit" id="submit" value="提交" /><br />
</form><br />

页面二test.php:
<br />
<?php<br />
	session_start();<br />
?><br />
<?php<br />
	$season=$_SESSION['season'];<br />
	echo '<b>读取会话<b/><hr />';<br />
	switch($season){<br />
		case '春天':<br />
			echo '现在是绿意盎然的 春天';<br />
			break;<br />
		case '夏天':<br />
			echo '现在是热情四溢的 夏天';<br />
			break;<br />
		case '秋天':<br />
			echo '现在是硕果累累的 秋天';<br />
			break;<br />
		case '冬天':<br />
			echo '现在是白雪皑皑的 冬天';<br />
			break;<br />
		default:<br />
			echo '对不起,会话中没有数据,或者不存在该会话。';<br />
	}<br />
?> <br />

运行页面一:

提交到页面二:

为什么会出现这种警告?怎么解决?除了设置session.auto_start=1
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