Late static binding

late-static-binding.php

<?php

class User
{
    public static $name = "Undefined";

    public static function stateName()
    {
        return self::$name;
    }

    /**
     * Early binding
     *
     * @return string
     */
    public static function show()
    {
        return self::stateName();
    }

    /**
     * Late static binding
     *
     * @return string
     */
    public static function get()
    {
        return static::stateName();
    }
}

class EarlyBinding extends User {
    public static function stateName()
    {
        return "This static method should not be called...";
    }
}

class LateStaticBinding extends User {
    public static function stateName()
    {
        return "Mohammad Bin";
    }
}

echo EarlyBinding::show();
echo "<br />";
echo LateStaticBinding::get();

// << output >>
// Undefined
// Mohammad Bin