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<?php /* * This file is part of the Fidry CPUCounter Config package. * * (c) Théo FIDRY <[email protected]> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ declare(strict_types=1); namespace Fidry\CpuCoreCounter\Finder; use function getenv; use function preg_match; use function sprintf; use function var_export; final class EnvVariableFinder implements CpuCoreFinder { /** @var string */ private $environmentVariableName; public function __construct(string $environmentVariableName) { $this->environmentVariableName = $environmentVariableName; } public function diagnose(): string { $value = getenv($this->environmentVariableName); return sprintf( 'parse(getenv(%s)=%s)=%s', $this->environmentVariableName, var_export($value, true), self::isPositiveInteger($value) ? $value : 'null' ); } public function find(): ?int { $value = getenv($this->environmentVariableName); return self::isPositiveInteger($value) ? (int) $value : null; } public function toString(): string { return sprintf( 'getenv(%s)', $this->environmentVariableName ); } /** * @param string|false $value */ private static function isPositiveInteger($value): bool { return false !== $value && 1 === preg_match('/^\d+$/', $value) && (int) $value > 0; } }