ProbabilisticSampler.php

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<?php
namespace Wikimedia\Telemetry;
 
use Wikimedia\Assert\Assert;
 
class ProbabilisticSampler implements SamplerInterface {
    private int $percentChance;
 
    public function __construct( int $percentChance ) {
        Assert::parameter(
            $percentChance >= 0 && $percentChance <= 100,
            '$percentChance',
            'must be between 0 and 100 inclusive'
        );
        $this->percentChance = $percentChance;
    }
 
    public function shouldSample( ?SpanContext $parentSpanContext ): bool {
        if ( $parentSpanContext !== null ) {
            return $parentSpanContext->isSampled();
        }
 
        return mt_rand( 1, 100 ) <= $this->percentChance;
    }
}