Small hash caching benchmark

CachedHash.php

<?php

class LazyCachedHash
{
    private $data = [];
    private $dataHash = null;
    
    public function __construct($data = array())
    {
        $this->data = $data;
    }
    
    public function getDataHash()
    {
        if (null === $this->dataHash) {
            $this->dataHash = md5(json_encode($this->data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
        }
        
        return $this->dataHash;
    }
}

class EagerCachedHash
{
    private $data = [];
    private $dataHash = null;
    
    public function __construct($data = array())
    {
        $this->data = $data;
        $this->dataHash = md5(json_encode($this->data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
    }
    
    public function getDataHash()
    {
        return $this->dataHash;
    }
}

class NonCachedHash
{
    private $data = [];
    
    public function __construct($data = array())
    {
        $this->data = $data;
    }
    
    public function getDataHash()
    {
        return md5(json_encode($this->data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
    }
}

$data = [
    'a' => 129841,
    //'b' => str_repeat('asdfgl;sdjfg;lsdjglkdsfjhglkdsfhglksdhglsdkghsdl;kgjdslkfgjhnsd;fbjsdflkfgjhsdlkrgjhsdlkghjsdlgkjhdsglksdhglksdjhglsdkjhgfsdlkjgfhnsdlkgjhsdlkgjfdsfgsdfgsdgsdgfsdgf'.PHP_EOL, 100)
    'b' => 'asdfgl;sdjfg;lsdjglkdsfjhglkdsfhglksdhglsdk'
];

$lazyCachedStart = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    $object = new LazyCachedHash($data);
    for ($j = 0; $j < 10; $j++) {
        $hash = $object->getDataHash();
    }
}
$lazyCachedStop = microtime(true);

$eagerCachedStart = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    $object = new EagerCachedHash($data);
    for ($j = 0; $j < 10; $j++) {
        $hash = $object->getDataHash();
    }
}
$eagerCachedStop = microtime(true);

$nonCachedStart = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    $object = new NonCachedHash($data);
    for ($j = 0; $j < 10; $j++) {
        $hash = $object->getDataHash();
    }
}
$nonCachedStop = microtime(true);

var_dump(array(
    'lazy' => ($lazyCachedStop - $lazyCachedStart),
    'eager' => ($eagerCachedStop - $eagerCachedStart),
    'non_cached' => ($nonCachedStop - $nonCachedStart)
));

> $ php7.2 CachedHash.php
array(3) {
  ["lazy"]=>
  float(0.10670709609985)
  ["eager"]=>
  float(0.096924066543579)
  ["non_cached"]=>
  float(0.52893090248108)
}