PHP – ZIP-file creation results in ZIP-file zipping itself - php

Question

The script I'm using to create a ZIP-file out of multiple files results in a russian ZIP doll: instead of overwriting a current ZIP-file with the same name as intended, it's zipping the existing ZIP-file plus the actual files.
The ZIP-file (always with the same name) is being created after a page update (= file-upload/deletion) in the CMS.
Although it's the CMS' syntax, I hope it's readable;
'file.create:after' => function ($file) {
$page = $file->page();
$files_to_zip = $page->files(); // array
$parent_folder = $page->parent()->dirname(); // string
$target_folder = $page->dirname(); // string
$zip = new ZipArchive();
$zip_file = "content/" . $parent_folder . "/" . $target_folder . "/somefile.zip";
$zip->open($zip_file, (ZipArchive::CREATE | ZipArchive::OVERWRITE));
foreach ($files_to_zip as $file_to_zip) {
$zip->addFile($file_to_zip->root(), basename($file_to_zip->filename()));
}
$zip->close();
}
Am I missing something concerning the overwriting if existing of the file?
Thanks for any input!

Answer 1

AFTER "rotation" you need to call $file->page->files()
You need to manually "rotate" the zip archives, or just delete it (not recomended since it can result in data loss)
'file.create:after' => function ($file) {
$page = $file->page();
$parent_folder = $page->parent()->dirname(); // string
$target_folder = $page->dirname(); // string
$zip = new ZipArchive();
$zip_file = "content/" . $parent_folder . "/" . $target_folder ."/somefile.zip";
//delete old rotation if exists
unlink($zip_file.'.backup');
//rotate current zip file to '****.backup'
rename($zip_file, $zip_file.'.backup');
$files_to_zip = $file->page()->files(); // array
$zip->open($zip_file, (ZipArchive::CREATE | ZipArchive::OVERWRITE));
foreach ($files_to_zip as $file_to_zip) {
$zip->addFile($file_to_zip->root(), basename($file_to_zip->filename()));
}
$zip->close();
}