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Filename : GreCalcMod11.php
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<?php

namespace App\gre\Models\helper;

if (!defined('URL')) {
    header("Location: /");
    exit();
}

/**
 * Description of GrsValCpf
 *
 * @copyright (c) year, Cesar Szpak - Celke
 */
class GreCalcMod11
{
    private $numero;
    private $Resultado;
               
    function getResultado()
    {
        return $this->Resultado;
    }
function mod11($numero = null){
    if($str = strlen($numero) < 1) return '';
    $str = strlen($numero);
    $cont = 7;
    for($i = 0; $i < $str; $i++){
        $arr_str[] = substr($numero, $i, 1);
    }
    
    foreach($arr_str as $digito){
        $result[] = $digito*$cont;
        $cont--;
    }
    
    $total = floatval( (array_sum($result)*10)/11);
    $digito        = explode(".", $total);
    $seg_num    = substr($digito[1], 1, 1);
    
    if($seg_num < 5){
        $dv = ($seg_num >0)? (substr($digito[1], 0, 1))+1 : '0';
    }else{
        $digito = explode(".", round($total, 1));
        $dv = (!$digito[1] || $digito[1] <= 9 )?$digito[1] : '0';
    }
    
    return $dv;
}    
}