A trait for converting numbers to and from integers/floats for display and storage.

ConvertsNumbers.php

<?php

namespace App\Traits; 

trait ConvertsNumbers {

    public function isConvertable($key)
    {
        if(!isset($this->convertable)) {
            return false;
        }
        return in_array($key, $this->convertable);
    }

    public function convertToInt($value)
    {
        return round($value, 2) * 100;
    }

    public function convertToFloat($value)
    {
        return number_format($value/100, 2, '.', '');
    }

    public function setAttribute($key, $value)
    {
        if (!$this->isConvertable($key)) {
            return parent::setAttribute($key, $value);
        }
        return parent::setAttribute($key, $this->convertToInt($value));
    }

    public function getAttribute($key)
    {
        if (!$this->isConvertable($key)) {
            return parent::getAttribute($key);
        }
        return $this->convertToFloat(parent::getAttribute($key));
    }

}

Model.php

<?php 

namespace App;

use App\Traits\ConvertsNumbers;

class MyClassName {

    use ConvertsNumbers;

    protected $convertable = [
        'one_attribute',
        'another_attribute',
    ];