Sprintf.php

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<?php
namespace Magento\Framework\Filter;

class Sprintf implements \Zend_Filter_Interface
{
    protected $format;

    protected $decimals;

    protected $decPoint;

    protected $thousandsSep;

    public function __construct($format, $decimals = null, $decPoint = '.', $thousandsSep = ',')
    {
        $this->format = $format;
        $this->decimals = $decimals;
        $this->decPoint = $decPoint;
        $this->thousandsSep = $thousandsSep;
    }

    public function filter($value)
    {
        if (null !== $this->decimals) {
            $value = number_format($value, $this->decimals, $this->decPoint, $this->thousandsSep);
        }
        $value = sprintf($this->format, $value);
        return $value;
    }
}