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Editing: save-files.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit( 'Direct\'s not allowed' );
}
//save files uploaded by user and modify data before inserting to database
add_filter( 'cf7d_modify_form_before_insert_data', 'cf7d_modify_form_before_insert_data_cb' );
if ( ! function_exists( 'cf7d_modify_form_before_insert_data_cb' ) ) {
	function cf7d_modify_form_before_insert_data_cb( $cf7 ) {
		//if it has at least 1 file uploaded
		if ( is_object( $cf7 ) && isset( $cf7->uploaded_files ) && count( $cf7->uploaded_files ) > 0 ) {
			$upload_dir         = wp_upload_dir();
			$cf7d_upload_folder = cf7d_upload_folder();
			$dir_upload         = $upload_dir['basedir'] . '/' . $cf7d_upload_folder;
			wp_mkdir_p( $dir_upload );
			foreach ( $cf7->uploaded_files as $k => $v ) {
				if ( ! empty( $v ) ) {
					$file = $v;
					if ( is_array( $file ) ) {
						$file = $file[0];
					}
					$file_name = basename( $file );
					$file_name = wp_unique_filename( $dir_upload, $file_name );
					$dst_file  = $dir_upload . '/' . $file_name;
					if ( @copy( $file, $dst_file ) ) {
						$cf7->posted_data[ $k ] = $upload_dir['baseurl'] . '/' . $cf7d_upload_folder . '/' . $file_name;
					}
				}
			}
		}
		return $cf7;
	}
}