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Correction status：qualified
Teacher's comments：理解还可以
Collection
Collection
foreach：
在php中数组可使用foreach()语句输出
foreach( $array as $key=>$value) {...}
<?php
$headline = '音乐';
$music = ['QQ音乐','酷狗音乐','酷我音乐'];
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title> <?php echo $headline ?> </title>
</head>
<body>
<h2><?php echo $headline ?></h2>
<ul>
<li><a href=""><?php echo 'QQ音乐' ?></a></li>
<li><a href=""><?php echo '酷狗音乐' ?></a></li>
<li><a href=""><?php echo '酷我音乐' ?></a></li>
</ul>
</body>
</html>
<?php
foreach ($music as $key=>$value){
echo $key+1 . ';' .$value .'<br>';
};
?>
<?php
echo '<ul>';
foreach ($music as $key=>$value) {
echo '<li><a href="">' . ($key+1) . ': ' . $value . '</a></li>';
}
echo '</ul>';
?>
<hr>
<ul>
<?php foreach ($music as $key=>$value) { ?>
<li><a href=""><?php echo ($key+1) . ':' . $value; ?></a></li>
<?php } ?>
</ul>
<hr>
<?php foreach ($music as $movie): ?>
<li><a href=""><?php echo $movie; ?></a></li>
<?php endforeach;?>点击 "运行实例" 按钮查看在线实例
![@SS]YUQX0XSMXC_WNEKRJSM.png](https://img.php.cn/upload/image/485/910/364/1564066386697830.png "1564066386697830.png")
2.get请求：
⑴请求参数以键值对的方式,附加到url地址上,称为查询字符串,用?号与当前脚本分隔
⑵url格式: index.php?name=peter&age=30
⑶受url长度限制, GET方式传递的数据也是有限制的
⑷服务器端脚本使用预定义变量数组 $_GET 进行接收
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title> get </title>
</head>
<body>
<form action="" method="get">
<p>
<label for="email">邮箱</label>
<input type="text" id="email" name="email" value="<?php echo isset($_GET['email']) ? $_GET['email']:'';?>" >
</p>
<p>
<label for="password">密码</label>
<input type="password" id="password" name="password" value="<?php echo isset($_GET['password']) ? $_GET['password']:''?>">
</p>
<p>
<button>登录</button>
</p>
</form>
</body>
</html>
<?php
//echo $_GET['email'];
//if (isset($_GET['email'])){
// echo $_GET['email'];
//}else {
// echo $_GET[''];
//}
echo isset($_GET['email']) ? $_GET['email']:'';
echo '<pre>';
print_r($_GET);
?>点击 "运行实例" 按钮查看在线实例
3.post请求：
（1）请求参数放在header请求头中发送, url地址看不到请求参数,适合敏感信息
（2）通常是通过表单提交并, 用来更新服务器上的信息
（3）适合发送大量的数据到服务器端, 长度受到配置文件限制,但比GET要大得多
（4）服务器端脚本使用预定义变量数
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title> POST </title> </head> <body> <form action="" method="post"> <p> <label for="email">邮箱</label> <input type="text" id="email" name="email" value="<?php echo isset($_POST['email']) ? $_POST['email']:'';?>" > </p> <p> <label for="password">密码</label> <input type="password" id="password" name="password" value="<?php echo isset($_POST['password']) ? $_POST['password']:''?>"> </p> <p> <button>登录</button> </p> </form> </body> </html> <?php echo isset($_POST['email']) ? $_POST['email']:''; echo '<pre>'; print_r($_POST) ?>
点击 "运行实例" 按钮查看在线实例
