Fastest way to fin if a key exists in an array with PHP 8

results.md

array(4) {
  'array_key_exists' =>
  double(0.76186203956604)
  'isset' =>
  double(0.78142905235291)
  'noCheck' =>
  double(0.80179715156555)
  'empty' =>
  double(0.80491018295288)
}

Null coallescent is not the better solution...

test.php

<?php

$a = [];
$result = [];

for($i=0;$i<20000000;$i++)
    $a[sha1($i)] = sha1($i);

$numIterations = 10000000;

echo 'start test '.chr(10);
$start = microtime(true);
for ($i = 0; $i < $numIterations; $i++) { $a['none'] ?? ''; };
$result['noCheck'] = microtime(true) - $start;


echo '2nd test '.chr(10);
$start = microtime(true);
for ($i = 0; $i < $numIterations; $i++) { empty($a['none']) ? '' : ''; };
$result['empty'] = microtime(true) - $start;


echo '3rd test '.chr(10);
$start = microtime(true);
for ($i = 0; $i < $numIterations; $i++) { isset($a['none']) ? '' : ''; };
$result['isset'] = microtime(true) - $start;

echo '4th test '.chr(10);
$start = microtime(true);
for ($i = 0; $i < $numIterations; $i++) { array_key_exists('none', $a) ? '' : ''; };
$result['array_key_exists'] = microtime(true) - $start;

asort($result);

var_dump($result);