How can I select and upload multiple files with HTML and PHP, using HTTP POST?

You can use the following HTML code to create a form that allows users to select and upload multiple files:

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

The enctype attribute specifies that the form will be sent as multipart/form-data, which is the encoding required for file uploads. The multiple attribute of the input element allows the user to select multiple files at once.

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Then, in your PHP code, you can access the uploaded files using the $_FILES superglobal array. Here's an example of how you can handle the file uploads in PHP:

<?php

$uploaded_files = $_FILES['files'];

foreach ($uploaded_files['name'] as $key => $name) {
  $tmp_name = $uploaded_files['tmp_name'][$key];
  $error = $uploaded_files['error'][$key];
  $size = $uploaded_files['size'][$key];

  // Check for errors
  if ($error == UPLOAD_ERR_OK) {
    // Move the uploaded file to the desired location
    move_uploaded_file($tmp_name, "uploads/$name");
  }
}

?>

This code iterates over the uploaded files and checks for any errors. If there are no errors, it moves the uploaded file to the uploads directory using the move_uploaded_file function.

We hope this helps! Let us know if you have any questions.