Upload files to WordPress PHP

upload_files_to_wordpress_php.php

<?php 

$final_submission = [];

if ( isset( $_FILES['files'] ) && is_array( $_FILES['files']) && !empty( $_FILES['files'] ) ) {
    $files = $_FILES['files'];

    $allowed_file_types = ['image/jpeg', 'image/png', 'video/mp4'];
    $max_file_size = 5 * 1024 * 1024; // 5MB
    $max_files = 5;


    if ( count( $files['name'] ) > $max_files ) {
        wp_send_json_error( 'Maximum 5 files are allowed' );
    }

    foreach ( $files['name'] as $key => $file_name ) {
        $file_type = $files['type'][$key];
        $file_size = $files['size'][$key];
        $file_error = $files['error'][$key];

        if ( ! in_array( $file_type, $allowed_file_types ) ) {
            wp_send_json_error( 'Only JPG, PNG and MP4 files are allowed' );
        }

        if ($file_size === 0) {
            wp_send_json_error( 'One or more files are empty' );
        }

        if ( $file_size > $max_file_size ) {
            wp_send_json_error( 'File size exceeds the limit' );
        }

        if ( $file_error !== UPLOAD_ERR_OK ) {
            wp_send_json_error( 'File upload error' );
        }
    }

    if ( ! function_exists( 'wp_handle_upload' ) ) {
        require_once( ABSPATH . 'wp-admin/includes/file.php' );
    }

    $uploaded_files = [];

    foreach ( $files['name'] as $key => $file_name ) {
        $file = [
            'name' => $file_name,
            'size' => $files['size'][$key],
            'type' => $files['type'][$key],
            'tmp_name' => $files['tmp_name'][$key],
            'error' => $files['error'][$key],
            'full_path' => $files['tmp_name'][$key],
            'type' => $files['type'][$key],
        ];

        $allowed_mimes = [
            'jpg|jpeg|jpe'	=> 'image/jpeg',
            'png'			=> 'image/png',
            'mp4'			=> 'video/mp4',
        ];

        $upload = wp_handle_upload( $file, [
            'test_form' => false,
            'mimes' => $allowed_mimes,
        ]);

        if ( isset( $upload['error'] ) ) {
            wp_send_json_error( $upload['error'] );
        }
        
        $uploaded_files[] = $upload;
    }

    $final_submission['files'] = $uploaded_files;
}