wp-includes/php-ai-client/src/Tools/DTO/FunctionCall.php:63Gets the function call ID.
string|null public function getId(): ?string { return $this->id; }Introduced in 0.1.0. Unchanged from 7.0.4 through 7.1.0.
Signature, return type and hooks compared across 2 parsed releases.
src/wp-includes/php-ai-client/src/Tools/DTO/FunctionCall.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.