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<?php declare(strict_types=1); function findNetworkWithIPAddress(array $payload, string $ipAddress): array { $network = array_values(array_filter($payload, function (array $networkInfo) use ($ipAddress) { $address = $networkInfo['address'] ?? ''; /** for PHP < 8.0 */ // return substr($address, 0, strlen($ipAddress)) === $ipAddress; /** for PHP >= 8.0 */ return str_starts_with($address, $ipAddress); })); return reset($network) ?: []; } $payload = [ [ ".id" => "*1", "address" => "10.9.4.109/24", "network" => "10.9.4.0", "interface" => "ether1", "actual-interface" => "ether1", "invalid" => false, "dynamic" => false, "disabled" => false, ], [ ".id" => "*2", "address" => "10.9.4.209/24", "network" => "10.9.4.0", "interface" => "ether2", "actual-interface" => "ether2", "invalid" => false, "dynamic" => false, "disabled" => false, ], ]; $network = findNetworkWithIPAddress($payload, '10.9.4.209'); $interfaceName = $network['interface'] ?? ''; var_dump($interfaceName);