How to delete all the zip files in current directory in php

Know about file location

1.     We are on 'C:\xampp\htdocs\letdelete\index.php

               In letdelete directory we have some zipp files  ,we want to delete all the zip files.

v      Alice.zip 

v      Mone.zip

v      Cane.zip

index.zip
$ar = array();
$ar1 = array();
$directory = "./";
$files = glob($directory ."*");
foreach($files as $file)
{
if (is_dir($file)) {
/* nothing to do*/
}else {
$ar1[] =  basename($file);
}
}
$ab=count($ar1);
for($a=0;$a<$ab;$a++)
{
$source=$ar1[$a];
if (strpos($source,'zip') !== false) {
if(file_exists($source))
{
unlink($source);
}    }     }