Flow PHP

SuperglobalCarrier implements Carrier

Read onlyYes

FinalYes

Read-only carrier backed by PHP superglobals.

Reads context from $_SERVER (HTTP headers), $_GET, $_POST, and $_COOKIE. This carrier is read-only and will throw if set() is called.

HTTP headers in $SERVER are normalized from HTTP* format:

HTTP_TRACEPARENT becomes 'traceparent'
HTTP_X_CUSTOM_HEADER becomes 'x-custom-header'

Example usage:

$propagator = new CompositePropagator([
    new W3CTraceContext(),
    new W3CBaggage(),
]);

$carrier = new SuperglobalCarrier();
$ctx = $propagator->extract($carrier);

Interfaces

Carrier: Carrier for propagating context across process boundaries.

Methods

get() : null|string: Get a value by key.
set() : void: Set a value.

get()

Get a value by key.


    public
                    get(string $key) : null|string

Key lookup should be case-insensitive for HTTP header compatibility.

Parameters

$key : string: The key to look up

Return values

null|string —

The value, or null if not found

set()

Set a value.


    public
                    set(string $key, string $value) : void

Parameters

$key : string: The key to set
$value : string: The value to set