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php实现多个上传

2026-02-15 22:39:15PHP

PHP 实现多个文件上传

在 PHP 中实现多个文件上传需要处理 $_FILES 超全局数组，并通过循环或批量处理方式管理上传的文件。以下是具体实现方法：

表单设置

确保 HTML 表单的 enctype 属性设置为 multipart/form-data，并允许通过 multiple 属性选择多个文件：

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

处理上传的文件

在 PHP 脚本（如 upload.php）中，通过遍历 $_FILES['files'] 数组处理每个文件：

if (isset($_FILES['files'])) {
    $uploadDir = 'uploads/';
    if (!is_dir($uploadDir)) {
        mkdir($uploadDir, 0755, true);
    }

    foreach ($_FILES['files']['tmp_name'] as $key => $tmpName) {
        $fileName = basename($_FILES['files']['name'][$key]);
        $targetPath = $uploadDir . $fileName;

        if (move_uploaded_file($tmpName, $targetPath)) {
            echo "File {$fileName} uploaded successfully.<br>";
        } else {
            echo "Failed to upload {$fileName}.<br>";
        }
    }
}

错误处理与验证

检查文件上传状态和类型，确保安全性：

foreach ($_FILES['files']['tmp_name'] as $key => $tmpName) {
    $error = $_FILES['files']['error'][$key];
    if ($error !== UPLOAD_ERR_OK) {
        echo "Error uploading file: " . $errorMessages[$error];
        continue;
    }

    $fileType = strtolower(pathinfo($_FILES['files']['name'][$key], PATHINFO_EXTENSION));
    $allowedTypes = ['jpg', 'png', 'pdf'];
    if (!in_array($fileType, $allowedTypes)) {
        echo "Invalid file type: {$fileType}.";
        continue;
    }
}

文件大小限制

通过 php.ini 或脚本内验证限制文件大小：

$maxSize = 2 * 1024 * 1024; // 2MB
foreach ($_FILES['files']['size'] as $key => $size) {
    if ($size > $maxSize) {
        echo "File exceeds maximum size limit.";
        continue;
    }
}