How to Implement Multi-File Uploads in PHP?

Multi-File Uploads in PHP: A Comprehensive Guide

When working with web forms, there are often scenarios where users need to upload multiple files. Handling multiple file uploads in PHP can be a bit more complex than uploading a single file, but understanding the process can help you build robust file-handling functionality.

Steps for Multiple File Uploading:

1. Input Configuration:

   • Ensure that your HTML input field has a name attribute that includes square brackets ([]) to indicate it's an array. For example: <input name="files[]" type="file" multiple>
   • To allow multiple file selection, use the multiple attribute.

2. Processing in PHP:

   • Use the following syntax to access the uploaded files: $_FILES['input_name']['param'][index]
   • The parameters you can access include tmp_name (temporary file path), name (original file name), size (file size in bytes), and type (file type).
   • Handle empty files or paths by using array_filter() to remove empty elements before processing.

Example Code:

HTML:

<input name="files[]" type="file" multiple>

PHP:

// Filter out empty file paths
$files = array_filter($_FILES['files']['name']);

// Count uploaded files
$total = count($files);

// Loop through files
for ($i = 0; $i < $total; $i++) {
  // Get temporary file path
  $tmpFilePath = $_FILES['files']['tmp_name'][$i];

  // Create new file path
  $newFilePath = "./uploads/" . $_FILES['files']['name'][$i];

  // Move uploaded file
  if (move_uploaded_file($tmpFilePath, $newFilePath)) {
    // Handle code for processing uploaded file
  }
}

By understanding these steps and using the provided example, you can implement multiple-file uploading functionality in your PHP applications. This allows users to select and upload multiple files simultaneously, enhancing the user experience and making it easy to gather and store file collections.

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