<?php class Head { public $mouth; private function __construct() { $this->mouth = new Mouth(); } private function hurts() { return [ `my ` . get_class($this) => `ouch!` ]; } public function recursive($painThreshold = 10) { $painThresholdMet = !$painThreshold; if ($painThresholdMet) { return $this->mouth; } $func = __FUNCTION__; $pain = $this->hurts()[`my Head`]; $this->mouth->speech .= $func functions hurt, $painn; return $this->$func($painThreshold - 1); } } class Mouth { public $speech = ``; public function __toString() { return $this->speech; } } $head = new Head(); $head->recursive(); echo $head->mouth; ©