php zipArchive unzip only certain extensions - php

Question

I'm in need of unziping uploaded content. But for security purposes must verify the files are only image files so that somebody can't add a php into the zip and then run it later.
While doing the unzip I need to preseverve the file structure as well.
$zip->extractTo($save_path . $file_name, array('*.jpg','*.jpeg','*.png','*.gif') );
doesn't return null. Is there a parameter I can use for this or must I iterate with a loop through the zip file using regex to match extensions and create the folders and save the files with code??
Thanks

Answer 1

from php.net, handling .txt files
<?php
$value="test.zip";
$filename="zip_files/$value";
$zip = new ZipArchive;
if ($zip->open($filename) === true) {
echo "Generating TEXT file.";
for($i = 0; $i < $zip->numFiles; $i++) {
$entry = $zip->getNameIndex($i);
if(preg_match('#\.(txt)$#i', $entry))
{
////This copy function will move the entry to the root of "txt_files" without creating any sub-folders unlike "ZIP->EXTRACTO" function.
copy('zip://'.dirname(__FILE__).'/zip_files/'.$value.'#'.$entry, 'txt_files/'.$value.'.txt');
}
}
$zip->close();
}
else{
echo "ZIP archive failed";
}
?>

Answer 2

for anyone who would need this in the future here is my solution. Thanks Ciro for the post, I only had to extend yours a bit. To make sure all folders are created I loop first for the folders and then do the extarction.
$ZipFileName = dirname(__FILE__)."/test.zip";
$home_folder = dirname(__FILE__)."/unziped";
mkdir($home_folder);
$zip = new ZipArchive;
if ($zip->open($ZipFileName ) === true)
{
//make all the folders
for($i = 0; $i < $zip->numFiles; $i++)
{
$OnlyFileName = $zip->getNameIndex($i);
$FullFileName = $zip->statIndex($i);
if ($FullFileName['name'][strlen($FullFileName['name'])-1] =="/")
{
#mkdir($home_folder."/".$FullFileName['name'],0700,true);
}
}
//unzip into the folders
for($i = 0; $i < $zip->numFiles; $i++)
{
$OnlyFileName = $zip->getNameIndex($i);
$FullFileName = $zip->statIndex($i);
if (!($FullFileName['name'][strlen($FullFileName['name'])-1] =="/"))
{
if (preg_match('#\.(jpg|jpeg|gif|png)$#i', $OnlyFileName))
{
copy('zip://'. $ZipFileName .'#'. $OnlyFileName , $home_folder."/".$FullFileName['name'] );
}
}
}
$zip->close();
} else
{
echo "Error: Can't open zip file";
}