<?php
$zip = new ZipArchive();
$filename = "file_path.zip";

if ($zip->open($filename)!==TRUE) {
    exit("cannot open <$filename>\n");
}
$zip->extractTo('target_folder'); 

echo "numfiles: " . $zip->numFiles . "\n";
echo "status:" . $zip->status . "\n";
$zip->close();