This section mainly introduces the multi-file upload function of PHP upload files. As long as the file upload tag in the form is named in the form of an array, multiple files can be uploaded simultaneously.

Let’s take a look at an example:
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<form enctype="multipart/form-data" action="<?=$_SERVER[&#39;PHP_SELF&#39;]?>" method="post">
    <input type="hidden" name="MAX_FILE_SIZE" value="104857600" />
    <table>
        <tr>
            <td>上傳文件：<input name="upload_file[]" type="file" size="50" /></td>
        </tr>
        <tr>
            <td>上傳文件：<input name="upload_file[]" type="file" size="50" /></td>
        </tr>
        <tr>
            <td>上傳文件：<input name="upload_file[]" type="file" size="50" /></td>
        </tr>
        <tr>
            <td>上傳文件：<input name="upload_file[]" type="file" size="50" /></td>
        </tr>
        <tr>
            <td><input type="submit" name="submit" value="上傳"/></td>
        </tr>
    </table>
</form>

<?php
    function upload($file_error, $file_tmp_name, $file_name){
        $info = "";

        if($file_name == "")
            return $info;

        switch($file_error){
            case UPLOAD_ERR_INI_SIZE:
                $info = $file_name. ": 文件大小超過了服務(wù)器的限制";
                break;
            case UPLOAD_ERR_FORM_SIZE:
                $info = $file_name. ": 文件大小超過了瀏覽器的限制";
                break;
            case UPLOAD_ERR_PARTIAL:
                $info = $file_name. ": 只上傳了部分文件";
                break;
            case UPLOAD_ERR_NO_FILE:
                $info = $file_name. ": 沒有文件被上傳";
                break;
            case UPLOAD_ERR_NO_TMP_DIR:
                $info = $file_name. ": 找不到臨時(shí)文件夾";
                break;
            case UPLOAD_ERR_CANT_WRITE:
                $info = $file_name. ": 文件寫入失敗";
                break;
            case UPLOAD_ERR_OK:
                $upload_dir = &#39;./&#39;.iconv("UTF-8","gb2312",$file_name);
                if(file_exists($upload_dir)){
                    $info = $file_name.": 同名文件已經(jīng)存在";
                }else{
                    if(move_uploaded_file($file_tmp_name,$upload_dir)){
                        $info = $file_name.": 文件上傳成功";
                    }else{
                        $info = $file_name.": 文件上傳失敗";
                    }
                }
                break;
        }
        return $info;
    }

    if(isset($_POST[&#39;submit&#39;])){
        $info = &#39;&#39;;
        $count = count($_FILES[&#39;upload_file&#39;][&#39;name&#39;]);
        for($i=0; $i<$count; ++$i){
            if($_FILES[&#39;upload_file&#39;][&#39;name&#39;][$i] == "")
                continue;
            $info = upload(
                $_FILES[&#39;upload_file&#39;][&#39;error&#39;][$i],
                $_FILES[&#39;upload_file&#39;][&#39;tmp_name&#39;][$i],
                $_FILES[&#39;upload_file&#39;][&#39;name&#39;][$i]
            );
        }
        echo $info;
    }

?>

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The code execution results are as follows:


Note:

1. In , name="upload_file[]" must be named in the form of an array. Otherwise, an error will occur: "Uninitialized string offset: 0", this sentence means that your array key value is out of bounds

2, $_FILES['upload_file']['name'][$i ], upload_file is the name of the upload file marker in the form. When uploading multiple files, the third-dimensional subscript of the array $_FILES will automatically be numbered sequentially starting from 0.

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