lized; } /** * Determines whether an offset value exists. * * @since 4.7.0 * * @link https://www.php.net/manual/en/arrayaccess.offsetexists.php * * @param mixed $offset An offset to check for. * @return bool True if the offset exists, false otherwise. */ public function offsetExists( $offset ) { return isset( $this->callbacks[ $offset ] ); } /** * Retrieves a value at a specified offset. * * @since 4.7.0 * * @link https://www.php.net/manual/en/arrayaccess.offsetget.php * * @param mixed $offset The offset to retrieve. * @return mixed If set, the value at the specified offset, null otherwise. */ public function offsetGet( $offset ) { return isset( $this->callbacks[ $offset ] ) ? $this->callbacks[ $offset ] : null; } /** * Sets a value at a specified offset. * * @since 4.7.0 * * @link https://www.php.net/manual/en/arrayaccess.offsetset.php * * @param mixed $offset The offset to assign the value to. * @param mixed $value The value to set. */ public function offsetSet( $offset, $value ) { if ( is_null( $offset ) ) { $this->callbacks[] = $value; } else { $this->callbacks[ $offset ] = $value; } } /** * Unsets a specified offset. * * @since 4.7.0 * * @link https://www.php.net/manual/en/arrayaccess.offsetunset.php * * @param mixed $offset The offset to unset. */ public function offsetUnset( $offset ) { unset( $this->callbacks[ $offset ] ); } /** * Returns the current element. * * @since 4.7.0 * * @link https://www.php.net/manual/en/iterator.current.php * * @return array Of callbacks at current priority. */ public function current() { return current( $this->callbacks ); } /** * Moves forward to the next element. * * @since 4.7.0 * * @link https://www.php.net/manual/en/iterator.next.php * * @return array Of callbacks at next priority. */ public function next() { return next( $this->callbacks ); } /** * Returns the key of the current element. * * @since 4.7.0 * * @link https://www.php.net/manual/en/iterator.key.php * * @return mixed Returns current priority on success, or NULL on failure */ public function key() { return key( $this->callbacks ); } /** * Checks if current position is valid. * * @since 4.7.0 * * @link https://www.php.net/manual/en/iterator.valid.php * * @return bool Whether the current position is valid. */ public function valid() { return key( $this->callbacks ) !== null; } /** * Rewinds the Iterator to the first element. * * @since 4.7.0 * * @link https://www.php.net/manual/en/iterator.rewind.php */ public function rewind() { reset( $this->callbacks ); } }