How to Efficiently Upload Multiple Files in PHP?

Uploading Multiple Files in PHP

Uploading multiple files in PHP is a common requirement, whether for user submissions or internal file management. Understanding the nuances involved is essential for seamless file uploads.

Key Considerations:

Input Element:

• name attribute must be defined as an array, e.g., name="inputName[]".
• Include multiple="multiple" or simply multiple to enable multiple file selection.

PHP Processing:

• Access uploaded files using $_FILES['inputName']['param'][index], where param can be name, tmp_name, etc.
• Check for empty file names and paths in the array, as it may contain empty strings. Use array_filter() to eliminate them.

Example:

HTML:

<input name="upload[]" type="file" multiple="multiple" />

PHP:

//$files = array_filter($_FILES['upload']['name']); //optional

// Count uploaded files
$total = count($_FILES['upload']['name']);

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

  if ($tmpFilePath != "") {
    // Set new file path
    $newFilePath = "./uploadFiles/" . $_FILES['upload']['name'][$i];

    // Upload file to temporary directory
    if(move_uploaded_file($tmpFilePath, $newFilePath)) {

      // Perform additional operations here

    }
  }
}

By following these guidelines, you can efficiently upload multiple files in PHP, ensuring reliable file management and data integrity.

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