124 lines
2.5 KiB
PHP
124 lines
2.5 KiB
PHP
<?php
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namespace App\Core\Ab;
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/**
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* class AbTest.
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*
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* @author Simon Vieille <simon@deblan.fr>
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*/
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class AbTest implements AbTestInterface
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{
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protected $results;
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protected array $variations = [];
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protected array $probabilities = [];
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protected int $duration = 3600 * 24;
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public function __construct(protected string $name)
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{
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}
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public function getName(): string
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{
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return $this->name;
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}
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public function getResult()
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{
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return $this->result;
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}
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public function setResult(string $result): self
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{
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$this->result = $result;
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return $this;
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}
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public function isValidVariation($variation): bool
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{
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return array_key_exists($variation, $this->variations);
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}
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public function addVariation(string $name, $value, int $probability = null): self
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{
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$this->variations[$name] = $value;
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$this->probabilities[$name] = $probability;
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return $this;
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}
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public function getVariation($variation)
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{
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return $this->variations[$variation];
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}
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public function getResultValue()
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{
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return $this->getVariation($this->getResult());
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}
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public function setDuration(int $duration): self
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{
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$this->duration = $duration;
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return $this;
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}
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public function getDuration(): int
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{
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return $this->duration;
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}
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public function run(): self
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{
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$this->result = $this->chance();
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return $this;
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}
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protected function chance(): string
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{
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$sum = 0;
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$empty = 0;
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foreach ($this->probabilities as $name => $value) {
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$sum += $value;
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if (empty($value)) {
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++$empty;
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}
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}
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if ($sum > 100) {
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throw new \LogicException('Test Error: Total variation probabilities is bigger than 100%');
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}
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if ($sum < 100) {
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foreach ($this->probabilities as $name => $value) {
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if (empty($value)) {
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$this->probabilities[$name] = (100 - $sum) / $empty;
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}
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}
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}
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krsort($this->probabilities);
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$number = mt_rand(0, (int) array_sum($this->probabilities) * 10);
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$starter = 0;
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$return = '';
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foreach ($this->probabilities as $key => $val) {
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$starter += $val * 10;
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if ($number <= $starter) {
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$return = $key;
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break;
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}
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}
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return $return;
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}
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}
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