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Editing: EnvVariableFinder.php

<?php

/*
 * This file is part of the Fidry CPUCounter Config package.
 *
 * (c) Théo FIDRY <theo.fidry@gmail.com>
 *
 * 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);

if (is_string($value) && 1 === preg_match('/^(\d+)m$/', $value, $matches)) {
            $millicores = $matches[1];
            $value = (string) floor($millicores / 1000);
        }

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;
    }
}

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