Trait to Implement Progress Bar for CLI's

ProgressBar.php

<?php
/**
 * Progress Bar Trait
 * @package    Core\Traits
 * @author     Marco Souza<marco.souza@tricae.com.br>
 */


namespace Core\Traits;


/**
 * Class ProgressBar
 * @package Core\Traits
 */
trait ProgressBar
{
    private $startTime;
    private $currentTime;
    private $spentTime;
    private $pendingTime;
    private $totalItems = 0;
    private $width = 30;
    private $percentage = 0;
    private $formattedPercentage = 0;
    private $countBar = 0;
    private $stdOut = '';


    /**
     * @param $quantity
     */
    protected function setTotalAndResetStartTime($quantity){
        $this->totalItems = $quantity;
        $this->resetStartTime();
    }

    protected function resetStartTime(){
        $this->startTime = time();
    }

    /**
     * @param $size
     */
    protected function setWidth($size){
        $this->width = $size;
    }

    /**
     * @param $currentPosition
     */
    protected function updateStatus($currentPosition){
        $this->recalculateTime($currentPosition);
        $this->recalculateStatus($currentPosition);
        $this->setStatusBar($currentPosition);
        $this->showStatusBar();
    }

    private function recalculateTime($currentPosition){
        $this->currentTime = time();
        $this->spentTime = $this->currentTime - $this->startTime;
        $averageTime = ($this->spentTime)/$currentPosition;
        $pendingItems = $this->totalItems - $currentPosition;
        $this->pendingTime = round($averageTime * $pendingItems, 0);
    }

    private function recalculateStatus($currentPosition){
        $this->percentage = (double)($currentPosition/$this->totalItems);
        $this->formattedPercentage = number_format($this->percentage*100, 0);
        $this->countBar = floor($this->percentage*$this->width);
    }

    private function setStatusBar($currentPosition){
        $this->appendBar();
        $this->appendStats($currentPosition);
        if($currentPosition == $this->totalItems) {
            $this->stdOut .= "\n";
        }
    }

    private function appendBar(){
        $barProcessed = str_repeat('=', $this->countBar);
        $this->stdOut ="\r[".$barProcessed;
        $barPending = str_repeat(' ', $this->width-$this->countBar);
        $this->stdOut .= ($this->countBar < $this->width ? '>' : '=').$barPending;
        $this->stdOut .=']';
    }

    private function appendStats($currentPosition){
        $this->stdOut .= " {$this->formattedPercentage}%  {$currentPosition}/{$this->totalItems}";
        $this->stdOut .= ' remaining:'.$this->getVerboseTime($this->pendingTime).'.  elapsed:'.$this->getVerboseTime($this->spentTime).'.';
    }

    private function getVerboseTime($seconds)
    {
        switch (true){
            case $seconds > 3600 :
                $verboseTime = gmdate(" G \h I \m s \s", $seconds);
                break;
            case $seconds > 60 :
                $verboseTime = gmdate(" I \m s \s", $seconds);
                break;
            default :
                $verboseTime = gmdate(" s \s", $seconds);
                break;
        }
        return $verboseTime;
    }

    private function showStatusBar(){
        echo $this->stdOut;
    }

}