This is a complete tasted just cope-and-paste function code for delete all files and directories in directory in PHP codes. 

<?php
//START- Function to delete all files and directories,recursively 
//folder address must not end with "/" and must not contain any "." in its address

function delete_all_in_folder($folder_addr) {
$folder_list = glob($folder_addr."/*");
if(count($folder_list)==0){
    echo "folder:".$folder_addr."<br>";
    rmdir($folder_addr);
}
else{
    foreach($folder_list as $filename){
        if($filename != null){
            $b=stristr($filename,"../");
            $b=substr($b,3);
            $a=stristr($b,".");
            if($a==null){//if it is a folder
                delete_all_in_folder($filename);
            }
            else{
                echo "file:".$filename."<br>";
                unlink($filename);
            }
        }
    }
    echo "folder:".$folder_addr."<br>";
    rmdir($folder_addr);
}
}
//END- Function to delete all files and directories,recursively 
?>