test3.php

<?php

namespace test;

use function hrtime;
use function printf;

class BinaryStream{

	protected string $buffer = "";
	protected $buffer2 = "";

	public function put(string $str) : void{
		$this->buffer .= $str;
	}

	public function put2(string $str) : void{
		$this->buffer2 .= $str;
	}
}

$stream = new BinaryStream();
$loops = 100_000;
$start = hrtime(true);
for($i = 0; $i < $loops; $i++){
	$stream->put("\xaa\xbb\xcc\xdd");
}
printf("Typed property time: %g ns/op\n", (hrtime(true) - $start) / $loops);

$start = hrtime(true);
for($i = 0; $i < $loops; $i++){
	$stream->put2("\xaa\xbb\xcc\xdd");
}
printf("Typeless property time: %g ns/op\n", (hrtime(true) - $start) / $loops);

xd