This is little example of using generators with recursion. Used version of php is 5.5.5
[php]
<?php
define ("DS", DIRECTORY_SEPARATOR);
define ("ZERO_DEPTH", 0);
define ("DEPTHLESS", -1);
define ("OPEN_SUCCESS", True);
define ("END_OF_LIST", False);
define ("CURRENT_DIR", ".");
define ("PARENT_DIR", "..");
function DirTreeTraversal($DirName, $MaxDepth = DEPTHLESS, $CurrDepth = ZERO_DEPTH)
{
if (($MaxDepth === DEPTHLESS) || ($CurrDepth < $MaxDepth)) {
$DirHandle = opendir($DirName);
if ($DirHandle !== OPEN_SUCCESS) {
try{
while (($FileName = readdir($DirHandle)) !== END_OF_LIST) { if (($FileName != CURRENT_DIR) && ($FileName != PARENT_DIR)) {
$FullName = $DirName.$FileName;
yield $FullName;
if(is_dir($FullName)) { $SubTrav = DirTreeTraversal($FullName.DS, $MaxDepth, ($CurrDepth + 1));
foreach($SubTrav as $SubItem) yield $SubItem;
}
}
}
} finally {
closedir($DirHandle);
}
}
}
}
$PathTrav = DirTreeTraversal("C:".DS, 2);
print "<pre>";
foreach($PathTrav as $FileName) printf("%s\n", $FileName);
print "</pre>";
[/php]