A small test to see what gets returned for the various "I want to know what class I'm in" patterns in PHP

which_class.php

<?php

class base {
    static function whoami_static() {
        echo('__CLASS__: ' . __CLASS__ . "\n");
        echo('get_class(): ' . get_class() . "\n");
        echo('get_called_class(): ' . get_called_class() . "\n");
        echo('static::class: ' . static::class . "\n");
    }

    function whoami() {
        echo('__CLASS__: ' . __CLASS__ . "\n");
        echo('get_class(): ' . get_class() . "\n");
        echo('get_called_class(): ' . get_called_class() . "\n");
        echo('static::class: ' . static::class . "\n");
    }
}

class derived extends base {
    function whoami() {
        parent::whoami();
        echo('-----------' . "\n");
        echo('__CLASS__: ' . __CLASS__ . "\n");
        echo('get_class(): ' . get_class() . "\n");
        echo('get_called_class(): ' . get_called_class() . "\n");
        echo('static::class: ' . static::class . "\n");
    }
}

base::whoami_static();
// Output:
// __CLASS__: base
// get_class(): base
// get_called_class(): base
// static::class: base

derived::whoami_static();
// Output:
// __CLASS__: base
// get_class(): base
// get_called_class(): derived
// static::class: derived

$base = new base();
$base->whoami();
// Output:
// __CLASS__: base
// get_class(): base
// get_called_class(): base
// static::class: base

$derived = new derived();
$derived->whoami();
// Output:
// __CLASS__: base
// get_class(): base
// get_called_class(): derived
// static::class: derived
// -----------
// __CLASS__: derived
// get_class(): derived
// get_called_class(): derived
// static::class: derived