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PanjiNamjaElf/in_array_vs_isset_vs_array_key_exists.php

Forked from alcaeus/in_array_vs_isset_vs_array_key_exists.php
Created August 28, 2025 03:55
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Performance comparision: in-array vs. isset vs. array_key_exists
Raw
in_array_vs_isset_vs_array_key_exists.php
<?php declare(strict_types = 1);
function testPerformance($name, Closure $closure, $runs = 1000000)
{
$start = microtime(true);
for (; $runs > 0; $runs--)
{
$closure();
}
$end = microtime(true);
printf("Function call %s took %.5f seconds\n", $name, $end - $start);
}
$items = [1111111];
for ($i = 0; $i < 100000; $i++) {
$items[] = rand(0, 1000000);
}
$items = array_unique($items);
shuffle($items);
$assocItems = array_combine($items, array_fill(0, count($items), true));
$in_array = function () use ($items) {
in_array(1111111, $items);
};
$isset = function () use ($assocItems) {
isset($items[1111111]);
};
$array_key_exists = function () use ($assocItems) {
array_key_exists(1111111, $assocItems);
};
testPerformance('in_array', $in_array, 100000);
testPerformance('isset', $isset, 100000);
testPerformance('array_key_exists', $array_key_exists, 100000);
Raw
result.md 
$ php in_array_vs_isset_vs_array_key_exists.php 
Function call in_array took 1.51871 seconds
Function call isset took 0.14684 seconds
Function call array_key_exists took 0.22123 seconds
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