knowhow.davidgrudl.com/php/isset-benchmark

`..`	`demo1.phps` 11,33 kB	`demo2.phps` 8,62 kB	`demo3.phps` 442 B	`demo4.phps` 474 B
`demo5.phps` 463 B	`run.php` 1,43 kB