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Correction status：qualified
Teacher's comments：
Collection
Collection
目录遍历
<?php
//传统目录遍历
$dir=opendir('../html/') or die('打开失败');
while (false != ($a=readdir($dir))){
if ($a!='.' && $a!='..'){
print $a.'<br>';
}
}
echo '<hr>';
//遍历目录数组
$file=scandir('../html/');
foreach($file as $a) {
if ($a != '.' && $a != '..') {
print $a . '<br>';
}
}点击 "运行实例" 按钮查看在线实例
文件上传与检测
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>" method="post" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="542488">
<fieldset>
<legend align="center" style="color: #FC0107">文件上传</legend>
<h3>选择文件：</h3><input type="file" name="upload">
<p align="center"><button type="submit" name="submit" >上传</button></p>
</fieldset>
</form>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
if (isset($_FILES['upload'])) {
$allow = ['image/jpg','image/jpeg', 'image/png'];
if (in_array($_FILES['upload']['type'], $allow)) {
if (move_uploaded_file($_FILES['upload']['tmp_name'], "upload/{$_FILES['upload']['name']}")){
echo "<script>alert('文件上传成功')</script>";
}
}else {
echo "<script>alert('仅允许上传jpg和png格式的图片')</script>";
}
}
if ($_FILES['upload']['error'] > 0 ) {
echo '<p>错误原因是:</p>';
switch ($_FILES['upload']['error']) {
case 1:
echo '文件超过了php.ini配置中设置的大小';
break;
case 2:
echo '文件上传大小超过了表单中常量设置的大小';
break;
case 3:
echo '仅有部分文件被上传';
break;
case 4:
echo '没有文件被上传';
break;
case 6:
echo '找不到临时文件夹';
break;
case 7:
echo '磁盘已满,写入失败';
break;
case 8:
echo '上传意外中止';
break;
default:
echo '系统未知错误';
break;
}
echo '</p>';
}
}
?>
</body>
</html>点击 "运行实例" 按钮查看在线实例