1. 创建一个数组,使用foreach与它的替代语法,在html中输出数组内容;
2. 创建一个表单, 演示get和post的数据处理过程
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<?php
$array1=["aaa",123,"你我他"];
foreach ($array1 as $key=>$value){
echo ($key+1).'.'.$value.'<br>';
};
foreach ($array1 as $key=>$value) :
echo ($key+1).'.'.$value.'<br>';
endforeach;
Echo "<hr>"
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="" method="get">
<label for="username">用户名：</label>
<input type="username" name="username" id="username" value="<?php echo isset($_GET['username'])?$_GET['username']:"请输入用户名"; ?>">
<label for="password">密码：</label>
<input type="password" name="password" id="password" value="">
<button>登陆</button>
</form>
<?php
print_r($_GET);
echo '<br>';
echo $_GET['username'];
echo '<br>';
var_dump(isset($_GET['username']));
echo '<br>';
//if (isset($_GET['username'])){
// echo $_GET['username'];
//}else{
// echo "请输入用户名";
//}
echo isset($_GET['username'])?$_GET['username']:"请输入用户名";
?>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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