PHP deletes the function code for a directory and all files in it

 
 
function destroyDir($dir, $virtual = false) 
{ 
$ds = DIRECTORY_SEPARATOR; 
$dir = $virtual ? realpath($dir) : $dir; 
$dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir; 
if (is_dir($dir) && $handle = opendir($dir)) 
{ 
while ($file = readdir($handle)) 
{ 
if ($file == '.' || $file == '..') 
{ 
continue; 
} 
elseif (is_dir($dir.$ds.$file)) 
{ 
destroyDir($dir.$ds.$file); 
} 
else 
{ 
unlink($dir.$ds.$file); 
} 
} 
closedir($handle); 
rmdir($dir); 
return true; 
} 
else 
{ 
return false; 
} 
}