bool mkdir ( string pathname [, intmode = 0777 [, bool recursive = FALSE [, resourcecontext ]]] )

<?php
   mkdir("/PhpProject/testing");
   echo "Directory created successfully!!!";
?>

Directory created successfully!!!

<?php
   structure = "/PhpProject/test1/test2/test3";

   if(!mkdir(structure, 0777, true)) {
      echo "Failed to create folders...";
   } else { 
       echo "Nested structure created successfully!!!";
   }
?>

Nested structure created successfully!!!