Filter Storage

FilterStorage.php

<?php
/**
 * Stores a value and calls any existing function with this value.
 */
class FilterStorage
{
    /**
     * Filled by __construct(). Used by __call().
     *
     * @type mixed Any type you need.
     */
    protected $values;

    /**
     * Stores the values for later use.
     *
     * @param  mixed $values
     * @return void
     */
    public function __construct( $values )
    {
        $this->values = $values;
    }

    /**
     * Catches all function calls except __construct().
     *
     * Be aware: Even if the function is called with just one string as an
     * argument it will be sent as an array.
     *
     * @param  string $callback Function name
     * @param  array  $arguments
     * @return mixed
     */
    public function __call( $callback, $arguments )
    {
        if ( is_callable( $callback ) )
        {
            return call_user_func( $callback, $arguments, $this->values );
        }
        // Wrong function called.
        throw new InvalidArgumentException(
            sprintf(
                'File: %1$s<br>
                Line %2$d<br>
                There is no function %3$s',
                __FILE__,
                __LINE__,
                $callback
            )
        );
    }
}