[Wordpress] Copies attachments from remote server (Production site)

copy_file_from_url.php

<?php
    /**
		 * Copies file from url to current path
		 * @param type $url
		 * @return type file_name on success else bool false
		 */
		function copy_file_from_url( $url ) {

			if( empty( $url ) )
				return false;

			// first check if url is accessable or not.
			// $headers = get_headers( $url, 1 );
			//
			// if( 'HTTP/1.0 404 Not Found' != reset( $headers ) )
			// 	return false;

			$local_upload_url 	= home_url() . '/wp-content/uploads';
			$live_upload_url 	= 'http://www.sitename.com/wp-content/uploads';
			$file_name 			= basename( $url );

			// extracting uploads section folder eg. 2016/01/02
			$file_path 		= ( strpos( $url, $local_upload_url ) > -1 )? str_replace( $local_upload_url, '', $url ): str_replace( $live_upload_url, '', $url );
			$source_url 	= str_replace( $local_upload_url, $live_upload_url, $url );
			$file_path		= str_replace( $file_name, '', $file_path );
			$upload_path 	= wp_upload_dir['upload_path'] . $file_path;

			// echo $upload_path . $file_name;
			// var_dump( file_exists( $upload_path . $file_name ) ); die;
			if( file_exists( $upload_path . $file_name ) ) {
					return;
			}

			if( ! file_get_contents( $source_url ) )
				return false;

			if ( ! file_exists( $upload_path ) ) {
				mkdir( $upload_path, 0777, true );
			}

			printf( "\Downloading {$upload_path}{$file_name} ...\n" );

			if( file_put_contents( $upload_path . $file_name, file_get_contents( $source_url ) ) ){
				return $file_name;
			}

			return false;
		}