PHP实现提交表单及输出例子
好吧这是我上次布置的作业,为了收尾就写篇教程,其实我还是觉得没什么好写的,方法非常的简单我们只要在当前页面判断是否为post或get有参数就进行获取输出例子.
题目也就是做个和演示差不多一个意思的了,给的提示应该是很充分的,包括各种函数都有.
在PHP 检查表单是否提交的两种方法中提到了如何检测提交,利用这个方法我们就可以节省一个HTML文件了.
$_POST是一个数组(超全局变量),如果页面的请求方式是POST,在这个数组里就会存上相应的内容.
empty()函数以前有讲过,还有一个isset()的区别文章后面也介绍过,然后基本上就很易懂了,源码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>注册系统</title>
</head>
<body>
<?php
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
?>
<h2 id="注册">注册</h2>
<form action="form-post.php" method="post">
用户名：<input type="text" name="username"><br/>
密码<input type="password" name="password"><br/>
<input type="checkbox" name="agree">同意许可协议<br/>
<input type="submit" name="submit" value="提交">
</form>
<?php
} else {
$problem = FALSE;
if (emptyempty($_POST['username'])) {
echo '请输入用户名<br/>';
$problem = TRUE;
}
if (emptyempty($_POST['password'])) {
echo '请输入密码<br/>';
$problem = TRUE;
}
if (emptyempty($_POST['agree'])) {
echo '您必须先同意许可协议<br/>';
$problem = TRUE;
}
if (!$problem) {
echo '<h2 id="注册成功">注册成功</h2>';
echo '欢迎' . $_POST['username'] . '你已成功注册，你的密码是' . $_POST['password'];
}
}
?>
</body>
</html>关于:empty()函数参数是非或非零的值,则empty()返回FALSE.
""，0，"0",NULL,FALSE,array(),var $var都被认为是空,如果函数为空,则返回TRUE.
isset()参数存在,则返回TRUE,否则返回FALSE,如果使用isset()测试一个被设置成NULL的变量或者使用unset()释放了一个变量,则返回FALSE.
复习:NULL字节(""）并不等同于PHP的NULL函数.
注:判断一个变量存在且不为空:!empty($var) - 推荐.
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