正確使用HTML表單和PHP循環(huán)處理多文件上傳。需設(shè)置form的enctype為multipart/form-data並使用name="files[]"，在PHP中通過(guò)遍歷$_FILES['files']獲取每個(gè)文件的tmp_name、name等信息，逐個(gè)調(diào)用move_uploaded_file保存；同時(shí)應(yīng)驗(yàn)證文件類型、大小，限制擴(kuò)展名，防止惡意上傳。例如允許小於2MB的JPEG、PNG、GIF文件上傳。

To upload multiple files at once in PHP, you need to adjust your HTML form and handle the file input correctly in your PHP script. The key is using array-style naming for file inputs and processing them in a loop.

Use Proper HTML Form Structure

Your form must allow multiple file selection and send data via POST with enctype="multipart/form-data" . To select multiple files from one input, use the multiple attribute. For uploading several files through separate fields, name the input as an array using square brackets.

Process Files in PHP Using Loops

When multiple files are uploaded, PHP organizes the $_FILES array differently. You'll need to restructure or loop through the data properly.

If you used name="files[]" , $_FILES['files'] will be a multidimensional array with keys like 'name', 'tmp_name', 'size', etc., each containing a list of values for every file.

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

for ($i = 0; $i $tmpName = $files['tmp_name'][$i];
if ($tmpName) {
$fileName = basename($files['name'][$i]);
$uploadPath = "uploads/" . $fileName;

if (move_uploaded_file($tmpName, $uploadPath)) {
echo "Uploaded: " . $fileName . "
";
} else {
echo "Failed to upload: " . $fileName . "
";
}
}
}

Add Validation and Security Checks

Always validate file types, sizes, and extensions before saving. This prevents malicious uploads.

• Check if the file has a valid extension (eg, jpg, png, pdf)
• Limit file size using $_FILES['error'] and PHP's upload limits
• Sanitize file names to avoid overwriting or directory traversal
• Store uploads outside the web root when possible

For example, to allow only images under 2MB:

$allowedTypes = ['image/jpeg', 'image/png', 'image/gif'];
if (in_array($files['type'][$i], $allowedTypes) && $files['size'][$i] // proceed with upload
}

Basically just structure the form right, loop through the files, and apply basic checks. It's straightforward once you understand how PHP groups multiple uploads in $_FILES .

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