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<?php declare(strict_types=1); error_reporting(-1); ini_set('display_errors', 'On'); interface Transip_DomainService { public const AVAILABILITY_INYOURACCOUNT = 'inyouraccount'; public const AVAILABILITY_UNAVAILABLE = 'unavailable'; public const AVAILABILITY_FREE = 'free'; public const AVAILABILITY_NOTFREE = 'notfree'; } $priority = [ Transip_DomainService::AVAILABILITY_FREE => 0, Transip_DomainService::AVAILABILITY_NOTFREE => 1, Transip_DomainService::AVAILABILITY_UNAVAILABLE => 2, Transip_DomainService::AVAILABILITY_INYOURACCOUNT => 3, ]; $domainCheckResults = [ (object) ['domainName' => 'a', 'status' => Transip_DomainService::AVAILABILITY_NOTFREE], (object) ['domainName' => 'b', 'status' => Transip_DomainService::AVAILABILITY_UNAVAILABLE], (object) ['domainName' => 'c', 'status' => Transip_DomainService::AVAILABILITY_INYOURACCOUNT], (object) ['domainName' => 'd', 'status' => Transip_DomainService::AVAILABILITY_FREE], (object) ['domainName' => 'e', 'status' => Transip_DomainService::AVAILABILITY_INYOURACCOUNT], (object) ['domainName' => 'f', 'status' => Transip_DomainService::AVAILABILITY_FREE], ]; usort($domainCheckResults, function ($a, $b) use ($priority) { return $priority[$a->status] <=> $priority[$b->status]; }); print_r($domainCheckResults);