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session_start();
$_SESSION['from_url'] = null;
$from_url = 'test2';
复制代码执行后会报这个错误:session_start();
echo $_SESSION['from_url'];
复制代码有人遇到过这种现象吗?
<?php
session_start();
$_SESSION['from_url'] = null;
$from_url = 'test2';
?>
<a href="test2.php">test</a>
session_start();
echo $_SESSION['from_url'];
echo $from_url;
( ! ) Notice: Undefined variable: from_url in D:\iis\test2.php on line 5
Call Stack
# Time Memory Function Location
1 0.0024 130128 {main}( ) ..\test2.php:0
error_reporting(2047);
session_start();
$_SESSION['from_url'] = null;
$from_url = 'test2';
echo 111;
echo $a;
flush();
sleep(5);
echo 222;