<form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>" method="POST" enctype="multipart/form-data">
<!-- 用隐藏域设置允许上传的文件大小,仅考参考 -->
<input type="hidden" name="MAX_FILE_SIZE" value="542488">
<fieldset>
<legend align="center">
文件上传
</legend>
<p>
<strong>选择文件:</strong>
<input type="file" name="upload">
</p>
</fieldset>
<p align="center">
<button type="submit" name="submit" >
上传
</button>
</p>
</form>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST'){
echo '判断请求类型为post成功<br>';
if (isset($_FILES['upload'])){
echo '判断控件数据成功<br>';
$allow = ['image/jpg','image/jpeg','image/png',];
if (in_array($_FILES['upload']['type'], $allow)){
echo '判断文件为图片成功<br>';
if (move_uploaded_file($_FILES['upload']['tmp_name'], "upload/{$_FILES['upload']['name']}")){
echo '判断文件上传成功<br>文件名为';
echo $_FILES['upload']['name'];
}
}else{
echo '文件非图片类型上传失败<br>';
}
}
if ($_FILES['upload']['error'] > 0 ){
echo '错误原因';
switch ($_FILES['upload']['error']) {
case 1:
echo '文件超过了php.ini配置中设置的大小';
break;
case 2:
echo '文件超过了表单中常量设置的大小';
break;
case 3:
echo '仅有部分文件被上传';
break;
case 4:
echo '没有文件被上传';
break;
case 6:
echo '没有可用的临时文件夹';
break;
case 7:
echo '磁盘已满,写入失败';
break;
case 8:
echo '上传意外中止';
break;
default:
echo '系统未知错误';
break;
}
if (file_exists($_FILES['upload']['tmp_name']) && is_file($_FILES['upload']['tmp_name'])) {
unlink($_FILES['upload']['tmp_name']);
}
}
}
?>对每一步判断进行输出检查，更加容易检查错误和修改
