Match indexes of two arrays in PHP to pair data - php

Question

I am doing a form with multiple files upload, for each file input there is a title input and I want to match the title with the file in order to be able to rename the file with the title.
I don't know how to match indexes of the two arrays to be able to do this.
Could someone help me? Thx
Here is my code so far ...
PHP :
$target_dir = 'files/';
if(isset($_POST['title']) && !empty($_POST['title'])){
$total_titles = count($_POST['title']);
for($key = 0; $key < $total_titles; $key++) {
// Clean retrieved client data
$pageName= $_POST['titles'];
}
// Check files
if(isset($_FILES['userfile']['name'])) {
// Count the number of uploaded files
$total_files = count($_FILES['userfile']['name']);
// Loop on uploaded files
for($key = 0; $key < $total_files; $key++) {
// Check if file is selected
if(isset($_FILES['userfile']['name'][$key]) && $_FILES['userfile']['size'][$key] > 0) {
$original_filename = $_FILES['userfile']['name'][$key];
// Get the file extension
$extension = pathinfo($original_filename, PATHINFO_EXTENSION);
// Get filename without extension
$filename_without_extension = basename($original_filename, '.'.$extension);
// Generate new filename
$new_filename = str_replace(' ', '_', $filename_without_extension) . '_' . '.' . $extension;
// Upload the file with new name
move_uploaded_file($_FILES['userfile']['tmp_name'][$key], $target_dir . $new_filename);
}
}
}
}
HTML
<div class="container">
<div class="row justify-content-center">
<!-- Page names -->
<form class="form col-xl-6" action="" id="page_list_section" method="post" enctype="multipart/form-data">
<input type="text" name="title[]" placeholder="Title" >
<input type="file" name="userfile[]" >
<input type="text" name="title[]" placeholder="Title" >
<input type="file" name="userfile[]" >
<input type="submit" name="Submit" value="Upload" >
</form>
</div>
</div>

Answer 1

Here is the match:
for($key = 0; $key < $total_files; $key++) {
$title = $_POST['title'][$key];
$filename = $_FILES['userfile']['name'][$key];
}