PHP同时上传“多个”文件示例，并格式化$_FILES数组信息

方法1：

在html表单，放置多个文件选择框，使用数组名作为组件的名字，如下：

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="upfile[]"/>
    <input type="file" name="upfile[]"/>
    <input type="file" name="upfile_2[]"/>
    <input type="file" name="upfile_2[]"/>
</form>

在服务器端我们可以测试一下提交的信息

<?php
print_r($_FILES);
?>

输出结果：

Array
(
    [upfile] => Array
        (
            [name] => Array
                (
                    [0] => C函数速查.chm
                    [1] => JDK_API_1_6中文帮助.CHM
                )
 
            [type] => Array
                (
                    [0] => application/octet-stream
                    [1] => application/octet-stream
                )
 
            [tmp_name] => Array
                (
                    [0] => D:PHPxampp2	mpphpF7E1.tmp
                    [1] => D:PHPxampp2	mpphpF7E2.tmp
                )
 
            [error] => Array
                (
                    [0] => 0
                    [1] => 0
                )
 
            [size] => Array
                (
                    [0] => 98791
                    [1] => 36830335
                )
 
        )
 
    [upfile_2] => Array
        (
            [name] => Array
                (
                    [0] => jquery1.7.2中文手册.chm
                    [1] => jQuery1.8.3中文手册.chm
                )
 
            [type] => Array
                (
                    [0] => application/octet-stream
                    [1] => application/octet-stream
                )
 
            [tmp_name] => Array
                (
                    [0] => D:PHPxampp2	mpphpF93A.tmp
                    [1] => D:PHPxampp2	mpphpF93B.tmp
               )

 
            [error] => Array
                (
                    [0] => 0
                    [1] => 0
                )
 
            [size] => Array
              (
                    [0] => 306357
                    [1] => 405941
                )
 
        )
 
)

方法2：

在html端为每一个input框给一个不同的name

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="upfile_1"/>
    <input type="file" name="upfile_2"/>
    <input type="file" name="upfile_3"/>
</form>

服务端“print_r($_FILES);” 后，输出的信息：

Array
(
    [upfile_1] => Array
        (
            [name] => C函数速查.chm
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphp2247.tmp
            [error] => 0
            [size] => 98791
        )
 
    [upfile_2] => Array
        (
            [name] => JDK_API_1_6中文帮助.CHM
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphp2248.tmp
            [error] => 0
            [size] => 36830335
        )
 
    [upfile_3] => Array
        (
            [name] => jquery1.7.2中文手册.chm
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphp23B0.tmp
            [error] => 0
            [size] => 306357
        )
 
)

所以，针对下面这个“综合性”上传表单：

<form action="upload.php" method="post" enctype="multipart/form-data" >
    <input type="file" name="upfile[]"/>
    <input type="file" name="upfile[]"/>
    <input type="file" name="upfile_2[]"/>
    <input type="file" name="upfile_2[]"/>
    <input type="file" name="upfile_3"/>
    <input type="file" name="upfile_4"/>
</form>

服务端接收到的数据为：

问题：上面的 $_FILES 信息有点乱，可以写个函数/方法来格式化下，参考代码如下：

function format_files($files)
{
    $fileArray = array();
    $n = 0;
    foreach ($files as $key => $file)
    {
        if (is_array($file['name']))
        {
            $keys = array_keys($file);
            $count = count($file['name']);
            for ($i = 0; $i < $count; $i++)
            {
                $fileArray[$n]['key'] = $key;
                foreach ($keys as $_key)
                {
                    $fileArray[$n][$_key] = $file[$_key][$i];
                }
                $n++;
            }
        }
        else
        {
            $fileArray[$n] = $file;
            $fileArray[$n]['key'] = $key;
            $n++;
        }
    }
 
    return $fileArray;
}

经过 format_files($_FILES); 处理后，结果被格式化为：

Array
(
    [0] => Array
        (
            [key] => upfile
            [name] => C函数速查.chm
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphpF27F.tmp
            [error] => 0
            [size] => 98791
        )
 
    [1] => Array
        (
            [key] => upfile
            [name] => JDK_API_1_6中文帮助.CHM
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphpF280.tmp
            [error] => 0
            [size] => 36830335
        )
 
    [2] => Array
        (
            [key] => upfile_2
            [name] => jquery1.7.2中文手册.chm
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphpF3C9.tmp
            [error] => 0
            [size] => 306357
        )
 
    [3] => Array
        (
            [key] => upfile_2
            [name] => jQuery1.8.3中文手册.chm
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphpF3CA.tmp
            [error] => 0
            [size] => 405941
        )
 
    [4] => Array
        (
            [name] => php_manual_zh.chm
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphpF3CB.tmp
            [error] => 0
            [size] => 31019182
            [key] => upfile_3
        )
 
    [5] => Array
        (
            [name] => TIPI深入理解PHP内核_2014-04-29_V0.8.3.chm
            [type] => application/octet-stream
            [tmp_name] => D:PHPxampp2	mpphpF4C6.tmp
            [error] => 0
            [size] => 1304181
            [key] => upfile_4
        )
 
)

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原文地址：https://www.cnblogs.com/qingsong/p/5003720.html