wp-includes/class-json.php:580array-walking function for use in generating JSON-formatted name-value pairs
$namestring$valuemixedstring function name_value($name, $value) { _deprecated_function( __METHOD__, '5.3.0', 'The PHP native JSON extension' ); $encoded_value = $this->_encode($value); if(Services_JSON::isError($encoded_value)) { return $encoded_value; } return $this->_encode((string) $name) . ':' . $encoded_value; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-json.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.