[PHP-NOTES] note 130493 added to language.oop5.static

I always thought that using `static` would be slightly faster... until I decided to test it and created this simple benchmark. 
To my surprise, the processing time is always (slightly) higher with `static`.

<?php

class Test {
    public static $valStatic = 0;
    public $valNormal = 0;

    public function sumStatic() {
        return self::$valStatic + 1;
    }

    public function sumNormal() {
        return $this->valNormal + 1;
    }
}

$t = new Test();

$start = microtime(true);
for ($i = 0; $i < 1000000; $i++) {
    $t->sumNormal();
}
echo 'Normal: ' . (microtime(true) - $start) . PHP_EOL;

$start = microtime(true);
for ($i = 0; $i < 1000000; $i++) {
    $t->sumStatic();
}
echo 'Static: ' . (microtime(true) - $start) . PHP_EOL;

// Outputs like: 
// Normal: 0.029894113540649
// Static: 0.03360915184021

?>
----
Server IP: 45.112.84.4
Probable Submitter: 45.112.84.18 (proxied: 191.184.3.188)
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