Download multiple images in zip in Wordpress - wordpress

Question

I am working on my personal wordpress site that distribute images.
In single post page, I registered several images via ACF(Advanced Custom Fields) and I know how to get image path/filename through get_field ACF function.
I just googled then found this page, but how can I apply this technique to wordpress site?
Download multiple images into zip
Now I am stuck...

Answer 1

On single post page, place the url of download_zip.php file, where you will place all your code for creating zip.
On single post page:
Download ZIP
In variable 'model_id', place the post id of the single post.
Now create a download_zip.php file on the root of your wordpress setup, where wp-config.php file exists.
Here is the code of download_zip.php file.
<?php
/*File for downloading the gallery zip files*/
$post_id = $_GET['model_id'];
require_once('wp-blog-header.php');
require_once('/wp-admin/includes/file.php');
WP_Filesystem();
$files_to_zip = array();
$zip = new ZipArchive();
$title = get_the_title($post_id);
$destination = wp_upload_dir();
//var_dump($destination);
$destination_path = $destination['basedir'];
$DelFilePath = str_replace(" ","_",$title).'_'.$post_id.'_'.time().'.zip' ;
$zip_destination_path = $destination_path."/".$DelFilePath;
if(file_exists($destination_path."/".$DelFilePath)) {
unlink ($destination_path."/".$DelFilePath);
}
if ($zip->open($destination_path."/".$DelFilePath, ZIPARCHIVE::CREATE) != TRUE) {
die ("Could not open archive");
}
//this is only for retrieving Repeater Image custom field
$row1 = get_field('acf_field_name1',$post_id);
$row1 = get_field('acf_field_name2',$post_id);
$rows = array($row1,$row2);
if($rows) {
foreach($rows as $row): ?>
<?php
$explode = end(explode("uploads",$row));
$index_file = array($destination_path,$explode);
$index_file = implode("",$index_file);
$new_index_file = basename($index_file);
$zip->addFile($index_file,$new_index_file);
endforeach;
}
$zip->close();
if(file_exists($zip_destination_path)) {
send_download($zip_destination_path);
}
//The function with example headers
function send_download($file) {
$basename = basename($file);
$length = sprintf("%u",filesize($file));
header($_SERVER['SERVER_PROTOCOL'].' 200 OK');
header('Content-Description: File Transfer');
header('Content-Type: application/zip');
header('Content-Disposition: attachment; filename="'.$basename.'"');
header('Content-Transfer-Encoding: binary');
header('Pragma: public');
header('Content-Length: ' . $length);
set_time_limit(0);
ob_clean();
flush();
readfile($file); // "Outputs" the file.
unlink($file);
}
?>
Please modify this code according to your requirement such as get_field(), place your image field name inside it, & define your upload directory, so that you can break the url in $explode variable for defining path of image in $index_file variable.
And please also check your destination path stored in $destination_path variable is correct or not.
Hope, this may be helpful to you.