What is the use of hidden controls in php
The function of php hidden controls is that when there are multiple forms to be submitted in the same interface, you can use hidden controls to judge the submitted forms. The use syntax is such as "".
PHP hidden control function
array_test.php：
<span style="font-size:18px;"><?php
//对于同一个界面中有多个表单要提交的情况，可以利用隐藏控件对所提交的表单进行判断；
//此处我只写一个表单为例，可以扩展到多个表单；
//隐藏控件还可以将一些不希望在前台看到的值传递给服务器；隐含传值
$arr=array(67,80,59,96,95);
//接受doing值，判断该用户所要做的操作
$doing=$_REQUEST['doing'];
if($doing=='seegrade') //如果要做的操作是查询学生成绩
{
$stuno=$_REQUEST['stuno']; //获取学生学号
if($stuno>=0 && $stuno<5)
{
//调用输出学生成绩函数
showgrade($stuno,$arr);
}
else
echo '查无此数';
}
function showgrade($stuno,&$arr)
{
//return $arr[$stuno];
echo $arr[$stuno];
}
?>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
</head>
<form action="array_test.php" method="post">
请输入学生学号：<input type="text" name="stuno"/><br>
<!--隐藏控件--作用见上面-->
<input type="hidden" name="doing" value="seegrade"/>
<input type="submit" value="查询成绩"/><br>
</form>
</html></span>The above is the detailed content of What is the use of hidden controls in php. For more information, please follow other related articles on the PHP Chinese website!
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