PHP mkdir()

    <?php

    // The directory path

    $dir = "testdir";

    // Check the existence of directory

    if(!file_exists($dir)){

        // Attempt to create directory

        if(mkdir($dir)){
            echo "Directory created successfully.";
        } else{
            echo "ERROR: Directory could not be created.";
        }
    } else{
        echo "ERROR: Directory already exists.";
    }
    ?>