wp-includes/SimplePie/src/Misc.php:1935Similar to parse_str()
$strstringarray public static function parse_str($str) { $return = []; $str = explode('&', $str); foreach ($str as $section) { if (strpos($section, '=') !== false) { [$name, $value] = explode('=', $section, 2); $return[urldecode($name)][] = urldecode($value); } else { $return[urldecode($section)][] = null; } } return $return; }One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
array to SimplePie\array<string,.verified against sourcesrc/wp-includes/SimplePie/src/Misc.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.