PHP: 上传多个文件

上传多个文件

可以对 input 域使用不同的 name 来上传多个文件。

PHP 支持同时上传多个文件并将它们的信息自动以数组的形式组织。要完成这项功能，需要在 HTML 表单中对文件上传域使用和多选框与复选框相同的数组式提交语法。

示例 #1 上传多个文件

<form action="file-upload.php" method="post" enctype="multipart/form-data">
  Send these files:<br />
  <input name="userfile[]" type="file" /><br />
  <input name="userfile[]" type="file" /><br />
  <input type="submit" value="Send files" />
</form>

当以上表单被提交后，数组 $_FILES['userfile']，$_FILES['userfile']['name'] 和 $_FILES['userfile']['size'] 将被初始化。

例如，假设名为 /home/test/review.html 和 /home/test/xwp.out 的文件被提交，则 $_FILES['userfile']['name'][0] 的值将是 review.html，而 $_FILES['userfile']['name'][1] 的值将是 xwp.out。类似的，$_FILES['userfile']['size'][0] 将包含文件 review.html 的大小，依此类推。

此外也同时设置了 $_FILES['userfile']['name'][0]， $_FILES['userfile']['tmp_name'][0]， $_FILES['userfile']['size'][0] 以及 $_FILES['userfile']['type'][0]。

警告

The max_file_uploads configuration setting acts as a limit on the number of files that can be uploaded in one request. You will need to ensure that your form does not try to upload more files in one request than this limit.

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User Contributed Notes 19 notes

down

348

phpuser at gmail dot com ¶

18 years ago

When uploading multiple files, the $_FILES variable is created in the form:

Array
(
    [name] => Array
        (
            [0] => foo.txt
            [1] => bar.txt
        )

    [type] => Array
        (
            [0] => text/plain
            [1] => text/plain
        )

    [tmp_name] => Array
        (
            [0] => /tmp/phpYzdqkD
            [1] => /tmp/phpeEwEWG
        )

    [error] => Array
        (
            [0] => 0
            [1] => 0
        )

    [size] => Array
        (
            [0] => 123
            [1] => 456
        )
)

I found it made for a little cleaner code if I had the uploaded files array in the form

Array
(
    [0] => Array
        (
            [name] => foo.txt
            [type] => text/plain
            [tmp_name] => /tmp/phpYzdqkD
            [error] => 0
            [size] => 123
        )

    [1] => Array
        (
            [name] => bar.txt
            [type] => text/plain
            [tmp_name] => /tmp/phpeEwEWG
            [error] => 0
            [size] => 456
        )
)

I wrote a quick function that would convert the $_FILES array to the cleaner (IMHO) array.

<?php

function reArrayFiles(&$file_post) {

    $file_ary = array();
    $file_count = count($file_post['name']);
    $file_keys = array_keys($file_post);

    for ($i=0; $i<$file_count; $i++) {
        foreach ($file_keys as $key) {
            $file_ary[$i][$key] = $file_post[$key][$i];
        }
    }

    return $file_ary;
}

?>

Now I can do the following:

<?php

if ($_FILES['upload']) {
    $file_ary = reArrayFiles($_FILES['ufile']);

    foreach ($file_ary as $file) {
        print 'File Name: ' . $file['name'];
        print 'File Type: ' . $file['type'];
        print 'File Size: ' . $file['size'];
    }
}

?>

down

i.g.e.o@ya (dot) ru ¶

3 years ago

A bit update to 14 year ago note from "phpuser at gmail dot com".
That update converts to a really more friendly array form incoming _POST info for uploaded files. 
And that variants works identical for non-multiple uploads and multiple uploads:
<?php
//Функция переформатирует массив поданных POST'ом файлов
function reArrayFiles(&$file_post){
    $isMulti    = is_array($file_post['name']);
    $file_count    = $isMulti?count($file_post['name']):1;
    $file_keys    = array_keys($file_post);

    $file_ary    = [];    //Итоговый массив
    for($i=0; $i<$file_count; $i++)
        foreach($file_keys as $key)
            if($isMulti)
                $file_ary[$i][$key] = $file_post[$key][$i];
            else
                $file_ary[$i][$key]    = $file_post[$key];

    return $file_ary;
}
?>

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wizzard351 at yahoo dot com ¶

9 years ago

This is also needed for <input type=file multiple> elements.

So, if you have an input element like this:
<input type="file" multiple="multiple" name="foobar" />
This should be written as
<input type="file" multiple="multiple" name="foobar[]" />
else you'll only be able to get one of the files.

down

Corey Ballou ¶

13 years ago

Here is a function to fix the indices of a multi-dimensional for easier parsing when dealing with file uploads.  It takes a single $_FILES field array as a parameter and separates each individual uploaded file by numeric key.  This allows for iterating like:

<?php
fixFilesArray($_FILES['array_of_files']);
foreach ($_FILES['array_of_files'] as $position => $file) {
    // should output array with indices name, type, tmp_name, error, size
    var_dump($file);
}
?>

Here's the code:

<?php
/**
 * Fixes the odd indexing of multiple file uploads from the format:
 *
 * $_FILES['field']['key']['index']
 *
 * To the more standard and appropriate:
 *
 * $_FILES['field']['index']['key']
 *
 * @param array $files
 * @author Corey Ballou
 * @link http://www.jqueryin.com
 */
function fixFilesArray(&$files)
{
    $names = array( 'name' => 1, 'type' => 1, 'tmp_name' => 1, 'error' => 1, 'size' => 1);

    foreach ($files as $key => $part) {
        // only deal with valid keys and multiple files
        $key = (string) $key;
        if (isset($names[$key]) && is_array($part)) {
            foreach ($part as $position => $value) {
                $files[$position][$key] = $value;
            }
            // remove old key reference
            unset($files[$key]);
        }
    }
}
?>

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timspeelman at live dot nl ¶

11 years ago

The cleanest way to rearrange the $_FILES

<?php
function rearrange( $arr ){
    foreach( $arr as $key => $all ){
        foreach( $all as $i => $val ){
            $new[$i][$key] = $val;    
        }    
    }
    return $new;
}
?>

down

sabryabdelmohsen at gmail dot com ¶

3 years ago

function reArrayImages($file_post) {
    $file_ary = [];
    $file_keys = array_keys($file_post);
    foreach ($file_post as $key => $value) {
      foreach ($value as $key2 => $value2) {
        $file_ary[$key2][$key] = $value2;
      }
    }
    return $file_ary;
}

down

lookphp at gmail dot com ¶

7 years ago

This is a very simple example:

Part I : HTML

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <form action="upload.php" method="post" multipart="" enctype="multipart/form-data">
        <input type="file" name="img[]" multiple>
        <input type="submit">
    </form>
</body>
</html>

Part II : PHP

<?php
echo '<pre>';
$img = $_FILES['img'];

if(!empty($img))
{
    $img_desc = reArrayFiles($img);
    print_r($img_desc);
    
    foreach($img_desc as $val)
    {
        $newname = date('YmdHis',time()).mt_rand().'.jpg';
        move_uploaded_file($val['tmp_name'],'./uploads/'.$newname);
    }
}

function reArrayFiles($file)
{
    $file_ary = array();
    $file_count = count($file['name']);
    $file_key = array_keys($file);
    
    for($i=0;$i<$file_count;$i++)
    {
        foreach($file_key as $val)
        {
            $file_ary[$i][$val] = $file[$val][$i];
        }
    }
    return $file_ary;
}

down

steam dot bakyt2 at gmail dot com ¶

6 days ago

Just combine temporary path with the filename which will result an array like:

array(2) {
  ["/tmp/phpAYCvcc"]=> string(10) "file1.jpg"
  ["/tmp/phpCDg79o"]=> string(10) "file2.jpg"
}

The code:

$files = array_combine(
     $_FILES['receipt']['tmp_name'], 
     $_FILES['receipt']['name']
);

foreach ($files as $key => $value) {
    // save your files locally
}

down

-5

jess at semlabs dot co dot uk ¶

14 years ago

If you try and upload files with multi-dimensional names like this:

<input type="file" name="submission[screenshot]" />
<input type="file" name="other[dem][][img][]" />

You will get an unexpected format like this:

<?php
array(
    'submission' => array
        (
            'name' => array( 'screenshot' => 'monster_wallpaper.jpg' ),
            'type' => array( 'screenshot' => 'image/jpeg' ),
            'tmp_name' => array( 'screenshot' => '/tmp/php48lX2Y' ),
            'error' => array( 'screenshot' => 0 ),
            'size' => array( 'screenshot' => 223262 ),
        ),
....
?>

You can use the following function to re-format the array recursively in the usual format:

<?php
function format_files_array( $files, $name = null, &$new = false, $path = false ){
    $names = array( 'name' => 'name', 'type' => 'type', 'tmp_name' => 'tmp_name', 'error' => 'error', 'size' => 'size' );
    
    foreach( $files as $key => &$part )
    {
        $key = ( string ) $key;
        if( in_array( $key, $names ) )
            $name = $key;
        if( !in_array( $key, $names ) )
            $path[] = $key;
        if( is_array( $part ) )
            $part = format_files_array( $part, $name, $new, $path );
        elseif( !is_array( $part ) )
        {
            $current =& $new;
            foreach( $path as $p )
                $current =& $current[$p];
            $current[$name] = $part;
            unset( $path );
            $name = null;
        }
    }
    
    return $new;
}
?>

down

-7

swayalex at gmail dot com ¶

8 years ago

Recursive solution for complex situations (supports any nested arrays including indexed arrays)

function getFixedFilesArray() {
    $walker = function ($arr, $fileInfokey, callable $walker) {
        $ret = array();
        foreach ($arr as $k => $v) {
            if (is_array($v)) {
                $ret[$k] = $walker($v, $fileInfokey, $walker);
            } else {
                $ret[$k][$fileInfokey] = $v;
            }
        }
        return $ret;
    };

    $files = array();
    foreach ($_FILES as $name => $values) {
        // init for array_merge
        if (!isset($files[$name])) {
            $files[$name] = array();
        }
        if (!is_array($values['error'])) {
            // normal syntax
            $files[$name] = $values;
        } else {
            // html array feature
            foreach ($values as $fileInfoKey => $subArray) {
                $files[$name] = array_replace_recursive($files[$name], $walker($subArray, $fileInfoKey, $walker));
            }
        }
    }

    return $files;
}

down

-6

Eric ¶

7 years ago

This is just a modification of the code which is the top note by "phpuser" here. His/her version requires that the $file_post array passed in to the function was created by a form submitted with the multiple attribute set. With multiple set in the html input tag, $_FILES["fileInputName"]["name"] is an array no matter if only one file is sent or multiple. But when <input type="file"> is used without the multiple attribute then $_FILES["fileInputName"]["name"] is not an array, it contains the the string with the filename. To use this neat function with or without multiple set and to get back an array which you can "foreach" over in either case, use this modification:

function reArrayFiles(&$file_post)
{
    $file_ary = array();
    $multiple = is_array($file_post['name']);

    $file_count = $multiple ? count($file_post['name']) : 1;
    $file_keys = array_keys($file_post);

    for ($i=0; $i<$file_count; $i++)
    {
        foreach ($file_keys as $key)
        {
            $file_ary[$i][$key] = $multiple ? $file_post[$key][$i] : $file_post[$key];
        }
    }

    return $file_ary;
}

down

-8

hotmail.com[at]notdefix ¶

16 years ago

With multiple file uploads

post_max_size: the total amount of data posted by the client (all files, and all other form field)

upload_max_filesize: the maximum size of 1 single file. (just like <input type="hidden" name="MAX_FILE_SIZE" value="..."/>)

so, with the directives:
 post_max_size 25M
 upload_max_filesize 2M

you can send 12 files of up to 2 MB and use up to 1 MB for your additional form-values.

As long as you read only a single copy of 1 file into memory, the memory_limit directive can be held reasonable small as well.

down

-13

contato at dgmike dot com dot br ¶

12 years ago

I prefer something like this!

<?php
public function arrayImages ( &$file_post )
{
    if( empty( $file_post ) ) {
        return $file_post;
    }
    if( 'array'!==gettype($file_post['name']) ) {
        return $file_post;
    }
    $keys = array_keys($file_post['name']);
    $file_array = array();
    foreach ($keys as $key) {
       foreach ($file_post as $res=>$item) {
           $file_array[$key][$res] = $item[$key];
       }
   }
   return $file_array;
}
?>

down

-9

jefrey no spam please at jefrey dot ml ¶

7 years ago

down

-32

javad dot geek at gmail dot com ¶

9 years ago

$countarray = count($_FILES['uploadfile']['name']);
                $newarray = array();
                for($i=0;$i<$countarray;$i++){
                    $newarray[$i]['name']=$_FILES['uploadfile']['name'][$i];
                    $newarray[$i]['type']=$_FILES['uploadfile']['type'][$i];
                    $newarray[$i]['tmp_name']=$_FILES['uploadfile']['tmp_name'][$i];
                    $newarray[$i]['error']=$_FILES['uploadfile']['error'][$i];
                    $newarray[$i]['size']=$_FILES['uploadfile']['size'][$i];
                }

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-37

ohcnim at hotmail dot com ¶

10 years ago

by simply naming differently each file input you'll get easily accesible arrays from $_FILES, in the form $_FILES['input_name']['file_attribute'].  For example:

$_FILES['input_name1']['name']...['input_name1']['size']
$_FILES['input_name2']['name']...['input_name2']['size']
$_FILES['input_nameX']['name']...['input_nameX']['size']

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-35

Pako ¶

8 years ago

If you want to upload multiple file at once, remember "multiple" attribute:

<input type="file" multiple="multiple" name="file[]" enctype="multipart/form-data"/>

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-5

simbiat at outlook dot com ¶

2 years ago

While code from phpuser.at.gmail.dot.com is good and i.g.e.o@ya.(dot).ru is even better, there is no end to perfection. We can live without temporary variables
<?php
foreach ($_FILES as $field=>$files) {
    #Check if multiple files were uploaded to a field and process the values accordingly
    if (is_array($files['name'])) {
        foreach ($files['name'] as $key=>$file) {
            $_FILES[$field][$key]['name'] = $file;
            $_FILES[$field][$key]['type'] = $files['type'][$key];
            $_FILES[$field][$key]['size'] = $files['size'][$key];
            $_FILES[$field][$key]['tmp_name'] = $files['tmp_name'][$key];
            $_FILES[$field][$key]['error'] = $files['error'][$key];
        }
    } else {
        $_FILES[$field][0]['name'] = $files['name'];
        $_FILES[$field][0]['type'] = $files['type'];
        $_FILES[$field][0]['size'] = $files['size'];
        $_FILES[$field][0]['tmp_name'] = $files['tmp_name'];
        $_FILES[$field][0]['error'] = $files['error'];
    }
    unset($_FILES[$field]['name'], $_FILES[$field]['type'], $_FILES[$field]['size'], $_FILES[$field]['tmp_name'], $_FILES[$field]['error']);
}
?>

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-32

Roman ¶

8 years ago

function reorganize($files) {
    foreach ($files as $var => $params) {
        foreach ($params as $name => $i) {
            foreach ($i as $num => $val) {
                $images[$var][$name] = $val;
                $arr[$num] = $images;
            }
        }
    }
    return $arr;
}

Array (
     [0] => Array ( 
         [image] => Array (
             [name] => white-rabbit-med-crop.jpg
             [type] => image/jpeg 
             [tmp_name] => E:\xampp\tmp\phpC008.tmp 
             [error] => 0 
             [size] => 343326 ) 
        ) 
    [1] => Array ( 
         [image] => Array ( 
             [name] => white-rabbit-med-crop.jpg 
             [type] => image/jpeg 
             [tmp_name] => E:\xampp\tmp\phpC008.tmp 
             [error] => 0 
             [size] => 1429802 )
        )
)

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