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老师批语：
<?php
if($_SERVER['REQUEST_METHOD']) { // 判断请求类型
//设置允许的文件类型
$allowed = ['image/jpeg','image/jpg','image/png'];
// echo '<pre>' . print_r($_FILES,true);
$type = $_FILES['user_pic']['type']; //获取用户上传文件的类型
$tmpName = $_FILES['user_pic']['tmp_name']; //获取用户上传文件的临时文件名
$name = $_FILES['user_pic']['name']; //获取用户上传文件的文件名
$error = $_FILES['user_pic']['error']; //获取用户上传是否成功的状态信息
if ($error > 0) {
echo '<script>alert("上传失败")</script>';
} elseif (in_array($type,$allowed)) {
//将文件从临时目录移动到目标目录中
if (move_uploaded_file($tmpName,'./uploads/'.$name)) {
echo '<script>alert("上传成功")</script>';
}
}
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<h2>上传用户头像</h2>
<!--1.请求类型必须是POST-->
<!--2.这个要设置成enctype="multipart/form-data"-->
<form action="" method="post" enctype="multipart/form-data">
请选择头像: <input type="file" name="user_pic" id="user_pic">
<button id="btn">上传</button>
</form>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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