Value.php

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<?php
class Zend_Memory_Value implements ArrayAccess {
    private $_value;

    private $_container;

    private $_trace;


    public function __construct($value, Zend_Memory_Container_Movable $container)
    {
        $this->_container = $container;

        $this->_value = (string)$value;

        $this->_trace = false;
    }


    public function offsetExists($offset)
    {
        return $offset >= 0  &&  $offset < strlen($this->_value);
    }

    public function offsetGet($offset)
    {
        return $this->_value[$offset];
    }

    public function offsetSet($offset, $char)
    {
        $this->_value[$offset] = $char;

        if ($this->_trace) {
            $this->_trace = false;
            $this->_container->processUpdate();
        }
    }

    public function offsetUnset($offset)
    {
        unset($this->_value[$offset]);

        if ($this->_trace) {
            $this->_trace = false;
            $this->_container->processUpdate();
        }
    }


    public function __toString()
    {
        return $this->_value;
    }


    public function &getRef()
    {
        return $this->_value;
    }

    public function startTrace()
    {
        $this->_trace = true;
    }
}