ProgressBar.php

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<?php
class Zend_ProgressBar
{
    protected $_min;

    protected $_max;

    protected $_current;

    protected $_startTime;

    protected $_statusText = null;

    protected $_adapter;

    protected $_persistenceNamespace = null;

    public function __construct(Zend_ProgressBar_Adapter $adapter, $min = 0, $max = 100, $persistenceNamespace = null)
    {
        // Check min/max values and set them
        if ($min > $max) {
            #require_once 'Zend/ProgressBar/Exception.php';
            throw new Zend_ProgressBar_Exception('$max must be greater than $min');
        }

        $this->_min     = (float) $min;
        $this->_max     = (float) $max;
        $this->_current = (float) $min;

        // See if we have to open a session namespace
        if ($persistenceNamespace !== null) {
            #require_once 'Zend/Session/Namespace.php';

            $this->_persistenceNamespace = new Zend_Session_Namespace($persistenceNamespace);
        }

        // Set adapter
        $this->_adapter = $adapter;

        // Track the start time
        $this->_startTime = time();

        // See If a persistenceNamespace exists and handle accordingly
        if ($this->_persistenceNamespace !== null) {
            if (isset($this->_persistenceNamespace->isSet)) {
                $this->_startTime  = $this->_persistenceNamespace->startTime;
                $this->_current    = $this->_persistenceNamespace->current;
                $this->_statusText = $this->_persistenceNamespace->statusText;
            } else {
                $this->_persistenceNamespace->isSet      = true;
                $this->_persistenceNamespace->startTime  = $this->_startTime;
                $this->_persistenceNamespace->current    = $this->_current;
                $this->_persistenceNamespace->statusText = $this->_statusText;
            }
        } else {
            $this->update();
        }
    }

    public function getAdapter()
    {
        return $this->_adapter;
    }

    public function update($value = null, $text = null)
    {
        // Update value if given
        if ($value !== null) {
            $this->_current = min($this->_max, max($this->_min, $value));
        }

        // Update text if given
        if ($text !== null) {
            $this->_statusText = $text;
        }

        // See if we have to update a namespace
        if ($this->_persistenceNamespace !== null) {
            $this->_persistenceNamespace->current    = $this->_current;
            $this->_persistenceNamespace->statusText = $this->_statusText;
        }

        // Calculate percent
        if ($this->_min === $this->_max) {
            $percent = false;
        } else {
            $percent = (float) ($this->_current - $this->_min) / ($this->_max - $this->_min);
        }

        // Calculate ETA
        $timeTaken = time() - $this->_startTime;

        if ($percent === .0 || $percent === false) {
            $timeRemaining = null;
        } else {
            $timeRemaining = round(((1 / $percent) * $timeTaken) - $timeTaken);
        }

        // Poll the adapter
        $this->_adapter->notify($this->_current, $this->_max, $percent, $timeTaken, $timeRemaining, $this->_statusText);
    }

    public function next($diff = 1, $text = null)
    {
        $this->update(max($this->_min, min($this->_max, $this->_current + $diff)), $text);
    }

    public function finish()
    {
        if ($this->_persistenceNamespace !== null) {
            unset($this->_persistenceNamespace->isSet);
        }

        $this->_adapter->finish();
    }
}