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How to implement multiple file upload in php

伊谢尔伦

Jun 24, 2017 pm 02:58 PM

phpuploadhowaccomplishdocument

In fact, multiple file uploads are similar to single file uploads. The principles are the same. First of all, it is still the index.html upload form, but the file in the previous file upload form is changed to file[ ]

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>upload files</title>
</head>
<body>
    <form action="upload.php" enctype="multipart/form-data" method="post">
        <input type="hidden" name="MAX_FILE_SIZE" value="100000" />
        上传文件：<input type="file" name="file[]"/><br/>
        上传文件：<input type="file" name="file[]"/><br/>
        上传文件：<input type="file" name="file[]"/><br/>    
        <input type="submit" value="上传" />
    </form>
</body>
</html>

Use $_FILES to print in upload.php and see

<?php　　
　　print_r($_FILES); 
?>

Get the followingMultidimensional array

Array
(
    [file] => Array
        (
            [name] => Array
                (
                    [0] => 照片1.jpg
                    [1] => 照片2.jpg
                    [2] => 照片3.jpg
                )
            [type] => Array
                (
                    [0] => image/jpeg
                    [1] => image/jpeg
                    [2] => image/jpeg
                )
            [tmp_name] => Array
                (
                    [0] => F:\wamp\tmp\php36C7.tmp
                    [1] => F:\wamp\tmp\php36C8.tmp
                    [2] => F:\wamp\tmp\php36C9.tmp
                )
            [error] => Array
                (
                    [0] => 0
                    [1] => 0
                    [2] => 0
                )
            [size] => Array
                (
                    [0] => 0
                    [1] => 0
                    [2] => 0
                )
        )
)

Upload as a single file principle, first think about what we need to get?

Obviously we need to get an array of file information. The array contains name, type, tmp_name, error, size. At this time, what we get is a multi-dimensional array. Although the corresponding key values exist, but It is multi-dimensional.

We only need to split it. For example, for the three files above, we only need to split it into the corresponding three file information arrays.

The structure of the split array

Array
(
    [0] => Array
        (
            [name] => 照片1.jpg
            [type] => image/jpeg
            [tmp_name] => F:\wamp\tmp\php13C1.tmp
            [error] => 0
            [size] => 385150
        )
    [1] => Array
        (
            [name] => 照片2.jpg
            [type] => image/jpeg
            [tmp_name] => F:\wamp\tmp\php13D2.tmp
            [error] => 0
            [size] => 242043
        )
    [2] => Array
        (
            [name] => 照片3.jpg
            [type] => image/jpeg
            [tmp_name] => F:\wamp\tmp\php13D3.tmp
            [error] => 0
            [size] => 488293
        )
)

The following is the code for splitting and reorganizing the array

<?php    
    //print_r($_FILES[&#39;file&#39;]);
    $arr=$_FILES[&#39;file&#39;];
    $files=array();
    for($i=0;$i<count($arr[&#39;name&#39;]);$i++){
        $files[$i][&#39;name&#39;]=$arr[&#39;name&#39;][$i];
        $files[$i][&#39;type&#39;]=$arr[&#39;type&#39;][$i];
        $files[$i][&#39;tmp_name&#39;]=$arr[&#39;tmp_name&#39;][$i];
        $files[$i][&#39;error&#39;]=$arr[&#39;error&#39;][$i];
        $files[$i][&#39;size&#39;]=$arr[&#39;size&#39;][$i];
    }
    print_r($files);
?>

The rest is simple. Repeat the steps of uploading a single file and traverse the process. The array will do.

The code is as follows:

<?php    
    //print_r($_FILES[&#39;file&#39;]);
    $arr=$_FILES[&#39;file&#39;];
    $files=array();
    for($i=0;$i<count($arr[&#39;name&#39;]);$i++){//count()统计数组键值name长度
        $files[$i][&#39;name&#39;]=$arr[&#39;name&#39;][$i];
        $files[$i][&#39;type&#39;]=$arr[&#39;type&#39;][$i];
        $files[$i][&#39;tmp_name&#39;]=$arr[&#39;tmp_name&#39;][$i];
        $files[$i][&#39;error&#39;]=$arr[&#39;error&#39;][$i];
        $files[$i][&#39;size&#39;]=$arr[&#39;size&#39;][$i];
    }
    for($i=0;$i<count($files);$i++){
    //取得上传文件信息
    $fileName=$files[$i][&#39;name&#39;];
    $fileType=$files[$i][&#39;type&#39;];
    $fileError=$files[$i][&#39;type&#39;];
    $fileSize=$files[$i][&#39;size&#39;];
    $tempName=$files[$i][&#39;tmp_name&#39;];//临时文件名
    
    //定义上传文件类型
    $typeList = array("image/jpeg","image/jpg","image/png","image/gif"); //定义允许的类型
    if($fileError>0){
            //上传文件错误编号判断
            switch ($fileError) {
                case 1:
                    $message="上传的文件超过了php.ini 中 upload_max_filesize 选项限制的值。"; 
                    break;
                case 2:
                    $message="上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。"; 
                    break;
                case 3:
                    $message="文件只有部分被上传。"; 
                    break;
                case 4:
                    $message="没有文件被上传。";
                    break;
                case 6:
                    $message="找不到临时文件夹。"; 
                    break;
                case 7:
                    $message="文件写入失败"; 
                    break;
                case 8:
                    $message="由于PHP的扩展程序中断了文件上传";
                    break;
            }
            exit("文件上传失败：".$message);
        }
    if(!is_uploaded_file($tempName)){
        //判断是否是POST上传过来的文件
        exit("不是通过HTTP POST方式上传上来的");
    }else{
        if(!in_array($fileType, $typeList)){
            exit("上传的文件不是指定类型");
        }else{
            if(!getimagesize($tempName)){
                //避免用户上传恶意文件,如把病毒文件扩展名改为图片格式
                exit("上传的文件不是图片");
            }
        }
            if($fileSize>1000000){
                //对特定表单的上传文件限制大小
                exit("上传文件超出限制大小");
            }else{
                //避免上传文件的中文名乱码
                $fileName=iconv("UTF-8", "GBK", $fileName);//把iconv抓取到的字符编码从utf-8转为gbk输出
                $fileName=str_replace(".", time().".", $fileName);//在图片名称后加入时间戳，避免重名文件覆盖
                if(move_uploaded_file($tempName, "uploads/".$fileName)){
                    echo "上传文件成功！";
                }else{
                    echo "上传文件失败";
                }
            }
        }
    }
?>

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