<?php
class Pipeline
{

	public function subPipe1($x)
	{
		$res = $x*3;
		$sp1 = $this->subPipe2($res);
		return $this->subPipe3($sp1);
	}

	private function subPipe2($x)
	{
		return $x+1;
	}

	private function subPipe3($x)
	{
		return $x/2;
	}
}

$var = new Pipeline();
echo $var->subPipe1(3);
?>