ParameterizedPassword.php

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<?php
abstract class ParameterizedPassword extends Password {
    protected $params = array();

    protected $args = array();

    protected function parseHash( $hash ) {
        parent::parseHash( $hash );

        if ( $hash === null ) {
            $this->params = $this->getDefaultParams();
            return;
        }

        $parts = explode( $this->getDelimiter(), $hash );
        $paramKeys = array_keys( $this->getDefaultParams() );

        if ( count( $parts ) < count( $paramKeys ) ) {
            throw new PasswordError( 'Hash is missing required parameters.' );
        }

        if ( $paramKeys ) {
            $this->args = array_splice( $parts, count( $paramKeys ) );
            $this->params = array_combine( $paramKeys, $parts );
        } else {
            $this->args = $parts;
        }

        if ( $this->args ) {
            $this->hash = array_pop( $this->args );
        } else {
            $this->hash = null;
        }
    }

    public function needsUpdate() {
        return parent::needsUpdate() || $this->params !== $this->getDefaultParams();
    }

    public function toString() {
        return
            ':' . $this->config['type'] . ':' .
            implode( $this->getDelimiter(), array_merge( $this->params, $this->args ) ) .
            $this->getDelimiter() . $this->hash;
    }

    abstract protected function getDelimiter();

    abstract protected function getDefaultParams();
}