![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Correction status：qualified
Teacher's comments：加点自己的总结就更完美了！
Collection
Collection
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传</title>
<style type="text/css">
span{
font-weight:bold;
}
</style>
</head>
<body>
<fieldset style="width:600px">
<legend>文件上传</legend>
<!-- $_SERVER['PHP_SELF']传输到当前界面 -->
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data">
<input type="file" name="upload" ><br>
<button type="submit">文件上传</button>
</form>
</fieldset>
<?php
//print_r($_SERVER);
//print_r($_FILES);
//echo __DIR__;
echo DIRECTORY_SEPARATOR;
if($_SERVER['REQUEST_METHOD'] == 'POST'){
//检测是否有文件上传
if (isset($_FILES['upload'])){
//设置允许上传的文件类型
$allow = array('image/jpg','image/gif','image/png');
if(in_array($_FILES['upload']['type'],$allow)){
//将文件上传到临时目录
$tmpdir = $_FILES['upload']['tmp_name'];
$desdir = __DIR__.DIRECTORY_SEPARATOR.$_FILES['upload']['name'];
// echo $tmpdir,'<br>';
// echo $desdir,'<br>';
if(move_uploaded_file($tmpdir,$desdir)){
echo '<script>alert("上传成功")</script>';
}else{
echo '<script>alert("移动失败")</script>';
}
}else{
echo '<script>alert("文件类型不对")</script>';
}
}else{
$res = $_FILES['upload']['error'];
switch($res){
//其值为 0，没有错误发生，文件上传成功。
case 1:
echo '<script>alert("上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值")</script>';
break;
case 2:
echo '<script>alert("上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值")</script>';
break;
case 3:
echo '<script>alert("文件只有部分被上传。")</script>';
break;
case 4:
echo '<script>alert("没有文件被上传。")</script>';
break;
case 7:
echo '<script>alert("文件写入失败。")</script>';
break;
case 6:
echo '<script>alert("找不到临时文件夹。")</script>';
break;
default:
echo '<script>alert("错误！</script>")';
break;
}
}
}else{
echo '<script>alert("上传方式不对")</script>';
}
?>
<hr>
<h3>遍历目录</h3>
<pre>
<?php
echo '<span>1.传统的过程函数：opendir() ,readdir(),closedir()</span><br>';
//$dir=__FILE__;常量，获取当前文件路径
echo '当前文件名是',basename(__FILE__),'<br>';//获取当前文件名
echo '当前目录是',dirname(__FILE__),'<br>'; //获取当前文件目录 和__DIR__一样
//__DIR__常量，获取当前文件目录
$dir=opendir(__DIR__) or die("目录打开失败");
while(($file=(readdir($dir))) != false){
echo nl2br($file."\n");
}
closedir($dir);
echo '<hr>';
echo '<span>2.目录扫描器scandir()</span><br>';
$filearr=scandir(__DIR__) or die("目录打开失败"); //返回值是数组
foreach($filearr as $file){
if($file!='.' && $file!='..'){
echo nl2br($file."\n");
}
}
?>
</pre>
</body>
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