xampp performance increase from 5.6 to 7.2

I remember when PHP 7 was released. The first thing I did was a simple performance test. I don’t remember the script exactly, but it was similar to this:

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<?php $time = microtime(true); $array = []; for ($i = 0; $i < 10000; $i++) {     if (!array_key_exists($i, $array)) {         $array[$i] = [];     }          for ($j = 0; $j < 1000; $j++) {         if (!array_key_exists($j, $array[$i])) {             $array[$i][$j] = true;         }     } } echo sprintf(     "Execution time: %f seconds\nMemory usage: %f MB\n\n",     microtime(true) - $time,     memory_get_usage(true) / 1042 / 1042 );

The results made me really happy. Memory usage was much lower and time execution had decreased a lot.

Recently, with the above script saved as “test.php”, I ran the test again, this time for multiple PHP version.

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#!/usr/bin/env bash versions=( 5.6 7.0 7.1 7.2 ) for v in "${versions[@]}" do     cmd="docker run --rm -ti -v ${PWD}/test.php:/test.php php:${v}-alpine3.7 php -d memory_limit=2048M test.php"     sh -c "echo ${v} && ${cmd}" done

With the results:

5.6
Execution time: 2.428468 seconds
Memory usage: 1332.009947 MB

7.0
Execution time: 0.601055 seconds
Memory usage: 347.669807 MB

7.1
Execution time: 0.517198 seconds
Memory usage: 347.669807 MB

7.2
Execution time: 0.470262 seconds
Memory usage: 347.669807 MB