前端表单提交文件
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<form action="PDO.php" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value="提交">
</form>
</body>
</html>
php接受并将文件从临时目录转移出来
<?php
$file=$_FILES['file'];
$filename=$file['name'];
move_uploaded_file($file['tmp_name'],'../css/'.$filename);//move_uploaded_file(文件名,位置);
echo "<img src='../css/$filename'>";//预览图片
?>