Benjamin Cremer bcremer

Web craftsman and open source enthusiast. I do web and linux stuff. Organizer of phpug.ms. Head of Architecture at @CHECK24.

bcremer / Sieve_of_Eratosthenes.php

Created August 27, 2020 07:08

Generate prime numbers using the Sieve of Eratosthenes, Lazily evaluted with PHP

	<?php

	// Generate prime numbers using the Sieve of Eratosthenes
	// Lazily evaluted
	// Inspired by: https://www.youtube.com/watch?v=5jwV3zxXc8E

	$primes = sieve(nat(2));

	foreach ($primes as $value) {
	echo $value . PHP_EOL;

bcremer / 0_output.log

Last active April 20, 2020 14:56

Measure array unpack vs. array_merge

bcremer / BaseTestCase.php

Created April 7, 2020 13:21

Reset PHPUnit testcase properties to save memory after each test.

	<?php

	abstract class BaseTestCase extends PHPUnit\Framework\TestCase
	{
	/**
	* Reset the properties to save memory after each test.
	* @see https://kriswallsmith.net/post/18029585104/faster-phpunit
	*/
	protected function tearDown(): void
	{

bcremer / php-pslam-functional-generators.php

Last active September 2, 2020 05:33

	<?php
	declare(strict_types=1);

	/**
	* @psalm-template TKey
	* @psalm-template TValue
	* @psalm-param iterable<TKey, TValue> $list
	* @psalm-param callable(TValue): bool $filter
	* @psalm-return Generator<TKey, TValue>
	*/

bcremer / ContainerTest.php

Last active February 4, 2020 05:44

	<?php

	declare(strict_types=1);

	namespace AppTest;

	use PHPUnit\Framework\TestCase;
	use Psr\Container\ContainerInterface;
	use function assert;
	use function strpos;

bcremer / measure_cpu_time.php

Last active May 8, 2020 06:40

Measure CPU Time / User / System Time in PHP Scripts

	<?php

	$measure = function (callable $lambda) {

	$rUsage = getrusage();
	$startUTime = $rUsage['ru_utime.tv_usec'] + $rUsage['ru_utime.tv_sec'] * 1000000;
	$startSTime = $rUsage['ru_stime.tv_usec'] + $rUsage['ru_stime.tv_sec'] * 1000000;
	$startHrTime = hrtime(true);

	$lambda();

bcremer / mysql-alternative-insert-syntax.sql

Last active February 4, 2019 07:33

MySQL alternative insert syntax

+-- Traditional insert
+INSERT INTO `campaigns` (name, active) VALUES ('foobar', 1⁾;
+-- Alternative insert
+INSERT INTO `campaigns` SET name = 'foobar', active = 1;

bcremer / IEEE754.php

Last active January 29, 2019 14:59

Why IEEE 754 floating point numbers are a mess to debug

	<?php
	// Live Demo: https://3v4l.org/GWJFZ
	// see also: http://0.30000000000000004.com/

	var_dump(0.1 + 0.2); // float(0.3)
	var_dump(0.3); // float(0.3)
	var_dump(0.1 + 0.2 == 0.3); // bool(false)

	// Set the number of significant digits displayed in floating point numbers.
	ini_set('precision', 18);

bcremer / IsNotInThePastValidation.php

Last active January 21, 2019 07:51

Thread on Twitter: https://twitter.com/benjamincremer/status/1086327888717041664

	<?php
	// $clock implements Clock
	// interface Clock
	// {
	// public function now() : DateTimeImmutable;
	// }

	// setup
	$startDate = Date::fromString('2019-01-04');

bcremer / Dockerfile

Created December 12, 2018 20:42

Multi-Stage Dockerfile to prepopulated MySQL Image

	## See: https://serverfault.com/a/915845/17736
	FROM percona/percona-server:5.7 as builder

	USER root

	RUN mkdir -p /initialized-db && chown -R mysql:mysql /initialized-db

	# That file does the DB initialization but also runs mysql daemon, by removing the last line it will only init
	RUN ["sed", "-i", "s/exec \"$@\"/echo \"not running $@\"/", "/docker-entrypoint.sh"]