PHP recursively copy files and directories, how to resolve

PHP recursively copy files and directories
Function del ($path) {
$handle = Opendir ($path);
Readdir ($handle);
Readdir ($handle), while (false!== ($file = Readdir ($handle))) {
$file = $path. " /". $file;

if (Is_dir ($file)) {
Del ($file);
}else{
if (unlink ($file)) {
echo "File". $file. " Success "." \ r \ n ";
}else{
echo "File". $file. " Failed "." \ r \ n ";
}
}
}
Closedir ($handle);
if (RmDir ($path)) {
echo "Catalog". $path. " Delete succeeded "." \ r \ n ";
}else{
echo "Catalog". $path. " Delete Failed "." \ r \ n ";
}

}

Del (' d:/123 ');

?>

Why use two times Readdir ($handle);? Solve, detail point, use one time why wrong?



------Solution--------------------
There are two special directories under a directory. And.. , representing this directory and the parent directory, these two readdir ($handle) is to read the two special directories to skip, so as to correctly manipulate the files and subdirectories under the specified directory.

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