PHP如何实现多文件上传 PHP批量文件处理的技术实现

multiple

$_FILES

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="uploadedFiles[]" multiple>
    <button type="submit">上传</button>
</form>

name="uploadedFiles[]"

multiple

multiple

uploadedFiles[]

upload.php

$_FILES

$_FILES['uploadedFiles']['name'][0]

$_FILES['uploadedFiles']['tmp_name'][0]

<?php
if (isset($_FILES['uploadedFiles'])) {
    $uploadDir = 'uploads/'; // 确保这个目录存在且可写
    if (!is_dir($uploadDir)) {
        mkdir($uploadDir, 0777, true);
    }

    $fileCount = count($_FILES['uploadedFiles']['name']);
    $results = [];

    for ($i = 0; $i < $fileCount; $i++) {
        $fileName = $_FILES['uploadedFiles']['name'][$i];
        $fileTmpName = $_FILES['uploadedFiles']['tmp_name'][$i];
        $fileError = $_FILES['uploadedFiles']['error'][$i];
        $fileSize = $_FILES['uploadedFiles']['size'][$i];
        $fileType = $_FILES['uploadedFiles']['type'][$i];

        if ($fileError === UPLOAD_ERR_OK) {
            // 避免路径遍历攻击，只取文件名部分
            $safeFileName = basename($fileName);
            // 生成唯一文件名，防止覆盖
            $uniqueFileName = uniqid() . '_' . $safeFileName;
            $targetFilePath = $uploadDir . $uniqueFileName; 

            // 简单做个类型和大小检查，实际应用中要更严格
            $allowedTypes = ['image/jpeg', 'image/png', 'application/pdf', 'text/plain'];
            $maxFileSize = 5 * 1024 * 1024; // 5MB

            // 更可靠的MIME类型检查
            $finfo = finfo_open(FILEINFO_MIME_TYPE);
            $realMimeType = finfo_file($finfo, $fileTmpName);
            finfo_close($finfo);

            if (in_array($realMimeType, $allowedTypes) && $fileSize <= $maxFileSize) {
                if (move_uploaded_file($fileTmpName, $targetFilePath)) {
                    $results[$fileName] = "上传成功，存储为: {$uniqueFileName}";
                    // 这里可以记录文件信息到数据库或进行其他处理
                } else {
                    $results[$fileName] = "上传失败：服务器写入错误。";
                }
            } else {
                $results[$fileName] = "上传失败：文件类型 ({$realMimeType}) 或大小 ({$fileSize} bytes) 不符合要求。";
            }
        } else {
            $errorMessages = [
                UPLOAD_ERR_INI_SIZE => '文件过大，超出php.ini限制。',
                UPLOAD_ERR_FORM_SIZE => '文件过大，超出表单限制。',
                UPLOAD_ERR_PARTIAL => '文件只有部分被上传。',
                UPLOAD_ERR_NO_FILE => '没有文件被上传。',
                UPLOAD_ERR_NO_TMP_DIR => '缺少临时文件夹。',
                UPLOAD_ERR_CANT_WRITE => '无法写入文件到磁盘。',
                UPLOAD_ERR_EXTENSION => 'PHP扩展阻止了文件上传。',
            ];
            $results[$fileName] = "上传发生错误： " . ($errorMessages[$fileError] ?? '未知错误，错误码: ' . $fileError);
        }
    }

    foreach ($results as $file => $status) {
        echo "文件 '{$file}': {$status}<br>";
    }
} else {
    echo "没有文件被上传。";
}
?>

basename($fileName)

$_FILES

name="myFiles[]"

multiple

$_FILES['myFiles']

name

type

tmp_name

error

size

a.jpg

b.png

$_FILES['myFiles']['name']

['a.jpg', 'b.png']

$_FILES['myFiles']['type']

['image/jpeg', 'image/png']

tmp_name

error

size

name

for

// 假设表单字段是 <input type="file" name="docs[]" multiple>
if (isset($_FILES['docs'])) {
    $totalFiles = count($_FILES['docs']['name']);
    for ($i = 0; $i < $totalFiles; $i++) {
        $fileName = $_FILES['docs']['name'][$i];
        $fileTmpPath = $_FILES['docs']['tmp_name'][$i];
        $fileError = $_FILES['docs']['error'][$i];
        // ... 然后处理这个文件
        if ($fileError === UPLOAD_ERR_OK) {
            // ... 移动文件，验证等
        } else {
            // 处理单个文件的错误
        }
    }
}

foreach ($_FILES['docs'] as $key => $value)

for

count($_FILES['docs']['name'])

error

UPLOAD_ERR_OK

UPLOAD_ERR_INI_SIZE

UPLOAD_ERR_FORM_SIZE

UPLOAD_ERR_PARTIAL

getimagesize()

// 验证MIME类型的一个简单示例
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mimeType = finfo_file($finfo, $fileTmpPath); // $fileTmpPath 是上传文件的临时路径
finfo