wp-includes/SimplePie/src/XML/Declaration/Parser.php:153Parse the input data
bool public function parse() { while ($this->state && $this->state !== self::STATE_EMIT && $this->has_data()) { $state = $this->state; $this->$state(); } $this->data = ''; if ($this->state === self::STATE_EMIT) { return true; } $this->version = ''; $this->encoding = ''; $this->standalone = ''; return false; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/SimplePie/src/XML/Declaration/Parser.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.