Enums

The library exposes seven enums on its public surface. All are PHP 8.1 backed enums; the value corresponds to the OPC UA-spec integer or URI.

BuiltinType::from(11) returns BuiltinType::Double.

$client->browse(
    'i=85',
    nodeClassMask: NodeClass::Variable->value | NodeClass::Method->value,
);

Helpers:

• isEcc(): bool — true for the four ECC cases
• getEcdhCurveName(): string — OpenSSL curve name (P-256 cases → 'prime256v1', etc.)
• getEphemeralKeyLength(): int — uncompressed-point byte length (64 for P-256, 96 for P-384)
• SecurityPolicy::from($uri) — parse the URI back into the case

The int values match the OPC UA Part 11 PerformUpdateType wire encoding. You normally don't construct the enum yourself — each typed history*Data() / history*Event() method picks the right case internally.

The Part 13 NodeIds are reference-only — the calculators run pure PHP, no server round-trip. Additional Part 13 aggregates are tracked in the roadmap — see Getting started · Start contributing.

StatusCode

StatusCode is a class, not an enum — OPC UA status codes are too many for a PHP enum to be ergonomic. Use it as a constant catalogue and as a helper:

use PhpOpcua\Client\Types\StatusCode;

StatusCode::isGood(0);                  // true
StatusCode::isBad(0x80340000);          // true (BadNodeIdUnknown)
StatusCode::isUncertain(0x40000000);    // true

StatusCode::getName(0x80340000);        // "BadNodeIdUnknown"

// Common bad codes:
StatusCode::BadNodeIdUnknown;           // 0x80340000
StatusCode::BadUserAccessDenied;        // 0x801F0000
StatusCode::BadServiceUnsupported;      // 0x800B0000
StatusCode::BadTimeout;                 // 0x800A0000
StatusCode::BadTypeMismatch;            // 0x80740000
StatusCode::BadOutOfRange;              // 0x803E0000
StatusCode::BadWriteNotSupported;       // 0x80730000

The bit layout (Part 4 §7.34):

• Bits 31–30 — severity: 00 = Good, 01 = Uncertain, 10 = Bad
• Bits 29–16 — sub-code (the meaning)
• Bits 15–0 — info bits (semantic flags rarely used directly)

The full catalogue of named codes is in src/Types/StatusCode.php — ~250 constants covering everything Part 4 §7.34 defines. Browse it in the IDE for autocomplete.

AttributeId

Like StatusCode, AttributeId is a class of integer constants — the OPC UA attribute IDs from Part 3 §5.9:

AttributeId::Value is the default for $client->read(); pass any of the others to read the corresponding attribute.