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Benchmarks merging two arrays using array_merge and classic foreach loop with manual addition.
<?php
class Benchmark
{
/**
* @param string $mergeStrategy
* @param int $arrayToMergeSize
*
* @return void
*/
public function run(string $mergeStrategy, int $arrayToMergeSize): void
{
$startMicrotime = microtime(true);
$mergedArray = [];
$extraBigArrayToMerge = [];
for ($i = 0; $i < 1000000; $i++) {
$mergedArray[] = 'hardcoded:'.$i;
}
for ($i = 0; $i < $arrayToMergeSize; $i++) {
$extraBigArrayToMerge[] = 'extra:'.$i;
}
if ($mergeStrategy === 'array_merge') {
$mergedArray = array_merge($mergedArray, $extraBigArrayToMerge);
}
if ($mergeStrategy === 'normal') {
foreach ($extraBigArrayToMerge as $element) {
$mergedArray[] = $element;
}
}
$endMicrotime = microtime(true);
echo sprintf(
"Merging two arrays using '%s' strategy took %d seconds.\n",
$mergeStrategy,
$endMicrotime - $startMicrotime
);
echo sprintf(
"Memory usage is: %d MB.\n",
memory_get_usage() / 1024 / 1024
);
echo sprintf(
"Memory peak was: %d MB.\n",
memory_get_peak_usage(true) / 1024 / 1024
);
}
}
$mergeStrategy = $argv[1];
$extraBigArraySize = $argv[2];
$benchmark = new Benchmark();
$benchmark->run($mergeStrategy, $extraBigArraySize);
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