想要显示窗体动作导致的错误消息。例如
<form action=a.php
input .....
</form>
<span.....>
<?php
$variable(Initially the value of this variable null according to the result of form value will change)
?>
</span>
对于特定条件,我想在 a.php 页面中设定一个可变的 $ 值, 并使用 header (); ();) 返回到格式页面。 但 $可变的 不改变 。 我如何从 a.php 更改可变的 $?
使用会议变数。
in the head of each document put
session_start();
在此之后, 您指定您所定义的要跨文档访问的变量 : $_SESSION[变量];
在使用标题 () 之前定义会话变量; 然后插入类似 :
if (isset($_SESSION[ variable ])){
print $_SESSION[ variable ];
unset($_SESSION[ variable ]);
}
PHP 变量不是持久性的, 当您将浏览器重定向到另一个位置时, 您的脚本执行被终止, 您将失去所有变量及其值 。 读到 < a href=> http:// bg. php. net/ manual/ en/ book. session. php" rel=“ nofollow” > session management 在 PHP 文档中存储请求间持续数据的方式 。
问题并不十分清楚,但听起来你需要这个:
if(isset($variable) AND $variable != ) echo "<span>$variable</span>";
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