直接附上代码吧！
先看上传单个文件
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>上传文件</title>
</head>
<body>
<!-- 上传文件必须将method改为post，并且加enctype="multipart/form-data" -->
<form action="" method="post" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="10000000">
<input type="file" name="file">
<input type="submit" name="submit" value="upload">
</form>
<br><br><br><br>
</body>
</html>
<?php
if(isset($_POST['submit'])){
$flag=true;
//验证文件大小
if($_FILES['file']['size']>$_POST['MAX_FILE_SIZE']){
echo "文件".$_FILES['file']['name']."的大小超出范围<br>";
$flag=false;
continue;
} else {
echo "文件".$_FILES['file']['name']."的符合大小要求<br>";
}
echo $_FILES['file']['type'];
//验证文件格式
$new_name="./upload/";//上传文件的根目录
switch($_FILES['file']['type']){
case "image/png":
case "image/gif":
case "image/jpeg":
case "image/x-png":
echo "上传的文件类型为图片<br>";
$new_name.="pic/";
break;
case "text/txt":
case "text/plain":
case "text/html":
echo "上传的文件类型为文本<br>";
$new_name.="text/";
break;
case "audio/basic":
case "audio/x-m4a":
echo "上传的文件类型为音频<br>";
$new_name.="audio/";
break;
case "video/mpeg":
echo "上传的文件类型为音频<br>";
$new_name.="video/";
break;
case "application/zip":
case "application/x-tar":
case "application/x-gz":
$new_name.="rar/";
echo "上传的文件类型为压缩文件<br>";
break;
case "application/msword":
case "application/powerpoint":
case "application/vnd.ms-excel":
$new_name.="office/";
echo "上传的文件类型为office办公文档<br>";
break;
case "application/x-msdownload":
$new_name.="software/";
echo "上传的文件类型是可执行文件<br>";
break;
default:
echo "文件类型不合格<br>";
$flag=false;
break;
}
//上传的文件名，可采用原文件名，也可采用时间加随机数作文件名
// $new_name.=$_FILES['file']['name'][$i];
$tmp_name=$_FILES['file']['name'];
$arr=explode(".",$tmp_name);
$extension=array_pop($arr);
//一定要注意采集文件后缀名时，有这种类型abc.1.5.exe,即有版本号的情况
$new_name.=date("YmdHis").rand(0,99).".".$extension;
if($flag&&move_uploaded_file($_FILES['file']['tmp_name'],$new_name)){
echo "上传成功<br><br><br><br>";
} else {
echo "上传失败<br><br><br><br>";
}
}
?>
再看上传多个文件
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>上传文件</title>
</head>
<body>
<!-- 上传文件必须将method改为post，并且加enctype="multipart/form-data" -->
<form action="" method="post" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="10000000">
<input type="file" name="file[]"><br>
<input type="file" name="file[]"><br>
<input type="file" name="file[]"><br>
<input type="file" name="file[]"><br><br>
<input type="submit" name="submit" value="upload"><br>
</form>
<br><br><br><br>
</body>
</html>
<?php
if(isset($_POST['submit'])){
//获取上传的文件数
$total_file_nums=count($_FILES['file']['name']);
for($i=0;$i<$total_file_nums;$i++){
$flag=true;
//验证文件大小
if($_FILES['file']['size'][$i]>$_POST['MAX_FILE_SIZE']){
echo "文件".$_FILES['file']['name'][$i]."的大小超出范围<br>";
$flag=false;
continue;
} else {
echo "文件".$_FILES['file']['name'][$i]."的符合大小要求<br>";
}
echo $_FILES['file']['type'][$i];
//验证文件格式
$new_name="./upload/";//上传文件的根目录
switch($_FILES['file']['type'][$i]){
case "image/png":
case "image/gif":
case "image/jpeg":
case "image/x-png":
echo "上传的文件类型为图片<br>";
$new_name.="pic/";
break;
case "text/txt":
case "text/plain":
case "text/html":
echo "上传的文件类型为文本<br>";
$new_name.="text/";
break;
case "audio/basic":
case "audio/x-m4a":
echo "上传的文件类型为音频<br>";
$new_name.="audio/";
break;
case "video/mpeg":
echo "上传的文件类型为音频<br>";
$new_name.="video/";
break;
case "application/zip":
case "application/x-tar":
case "application/x-gz":
$new_name.="rar/";
echo "上传的文件类型为压缩文件<br>";
break;
case "application/msword":
case "application/powerpoint":
case "application/vnd.ms-excel":
$new_name.="office/";
echo "上传的文件类型为office办公文档<br>";
break;
case "application/x-msdownload":
$new_name.="software/";
echo "上传的文件类型是可执行文件<br>";
break;
default:
echo "文件类型不合格<br>";
$flag=false;
break;
}
//上传的文件名，可采用原文件名，也可采用时间加随机数作文件名
// $new_name.=$_FILES['file']['name'][$i];
$tmp_name=$_FILES['file']['name'][$i];
$arr=explode(".",$tmp_name);
$extension=array_pop($arr);
//一定要注意采集文件后缀名时，有这种类型abc.1.5.exe,即有版本号的情况
$new_name.=date("YmdHis").rand(0,99).".".$extension;
if($flag&&move_uploaded_file($_FILES['file']['tmp_name'][$i],$new_name)){
echo "上传成功<br><br><br><br>";
} else {
echo "上传失败<br><br><br><br>";
}
}
}
?>
其实这个代码上传多个文件有很多bug，比如只上传一个，或者个数不确定，都不好用