Financial calculation in a laravel 5 project

This package is suited for you if you want to build a Laravel 5 application that manage financial numbers (tva, prices, ...). PHP float numbers are not exact due to the floating part.

Float Number

For decimal numbers you should use the FloatNumber class.

Helpers :

calculator Get the calculator instance :

 $calculator = calculator();
 $calculator->add(.. , ...);
 ....

check_is_integer Check if a given is integer or not. The is_int of php those not check the integer value given as strings

as_float_number Convert a given value to an instance of FloatNumber. Default scale is 2

Usage :

Add the service provider and the facade to the config/app.php file :

    Enimiste\L5Math\Providers\L5MathServiceProvider::class;

    'Calculator' => 'Enimiste\L5Math\Facades\CalculatorFacade::class;

You can access the calculator with two ways :

• Calculator facade class
• calculator() helper function

Add model mutators :

For fields that you want to convert them and forward from FloatNumber to DB decimal types you should add :

   public function set[Yourattribute]Attribute($value){
        $this->attribute['price'] = as_float_number($value);//__toString() function of VONumber is used to passe data to db
   }
   
   public function get[Yourattribute]Attribute($value){
        return as_float_number($value);
   }

Calculator features :

interface Calculator {

	/**
	 * Multiplication
	 *
	 * @param Number $l
	 * @param Number $r
	 *
	 * @return Number
	 */
	public function mult( Number $l, Number $r );

	/**
	 * Calculate the TTC price from HT and TVA
	 *
	 * @param FloatNumber $ht
	 * @param FloatNumber $tva between 0 and 1
	 *
	 * @return FloatNumber
	 */
	public function ttc( FloatNumber $ht, FloatNumber $tva );

	/**
	 * Add two Numbers
	 *
	 * @param Number $l
	 * @param Number $r
	 *
	 * @return Number
	 */
	public function add( Number $l, Number $r );

	/**
	 * @param IntegerNumber $quantite
	 * @param FloatNumber   $prixUnitaireHt
	 * @param FloatNumber   $tva
	 *
	 * @return PriceResultDto
	 */
	public function price( IntegerNumber $quantite, FloatNumber $prixUnitaireHt, FloatNumber $tva );

	/**
	 * Build TVA as value betwenn 0 and 1 from a value from 0 to 100
	 *
	 * @param FloatNumber $tva
	 *
	 * @return FloatNumber
	 */
	public function tva( FloatNumber $tva );

	/**
	 * Sub two Numbers
	 * $l - $r
	 *
	 * @param Number $l
	 * @param Number $r
	 *
	 * @return Number
	 */
	public function sub( Number $l, Number $r );
}

Example :

Assume we have a Product and an Ordre entities that we have to manage in our application.

Migrations

   //products table
   $table->increments('id');
   $table->string('title')->unique();
   $table->decimal('price', 8, 2);//000000.00
   $table->decimal('tva', 5, 2)->default(20.0);//between 0.00 and 100.00
   
   //orders table
   $table->increments('id');
   $table->unsignedInteger('amount');//count of product ordered
   $table->decimal('total_ht', 8, 2);// amount * price
   $table->decimal('total_ttc', 8, 2);
   $table->unsignedInteger('product_id');

Models

class Product extends Model {

   protected $fillable = ['title', 'price', 'tva'];
   
   public function setPriceAttribute($value){
        $this->attribute['price'] = as_float_number($value);
   }
   
   public function getPriceAttribute($value){
        return as_float_number($value);
   }
   
   public function setTvaAttribute($value){
       $this->attribute['tva'] = as_float_number($value);
   }
   
   public function getTvaAttribute($value){
       return as_float_number($value);
   }

}

class Order extends Model {

   protected $fillable = ['amount', 'total_ht', 'total_ttc', 'product_id'];
   
   public function setTotalHtAttribute($value){
        $this->attribute['total_ht'] = as_float_number($value);
   }
   
   public function getTotalHtAttribute($value){
        return as_float_number($value);
   }
   
   public function setTotalTtcAttribute($value){
        $this->attribute['total_ttc'] = as_float_number($value);
   }
      
   public function getTotalTtcAttribute($value){
       return as_float_number($value);
   }

}

Seed

 $p = Product::create(
        [
            'price' =>  100.76,
            'tva'   =>  20.0
        ]
 );
 
 $calc = calculator();
 
 $o1 = Order::create(
        [
            'product_id'    =>  $p->id,
            'amount'        =>  33,
            'total_ht'      =>  $ht = $calc->mult($p->price, new Enimiste\Math\VO\IntegerNumber(33)),
            'total_ttc'     =>  $calc->ttc($ht, $calc->tva($p->tva))
        ]
 );

//NB : $calc->tva convert a tva as % to float value between 0 and 1
//another way

 $price = $calc->price(new Enimiste\Math\VO\IntegerNumber(78), $p->price, $calc->tva($p->tva));
 $o2 = Order::create(
        [
            'product_id'    =>  $p->id,
            'amount'        =>  $price->quantite,
            'total_ht'      =>  $price->ht,
            'total_ttc'     =>  $price->ttc
        ]
 );

Echo 1:

 $products = Product::all();
 
 foreach($products as $p){
    echo 'Price : $' . $p->price->__toString() . PHP_EOL;
    echo 'Tva : ' . $p->tva->__toString() . '%' . PHP_EOL;
 }

Will output :

 Price : $100.76
 Tva : 20.00%

Echo 2:

 $orders = Order::all();
 
 foreach($orders as $o){
    echo 'Amount : $' . $o->amount . PHP_EOL;
    echo 'Total Ht : $' . $o->total_ht->__toString() . PHP_EOL;
    echo 'Total Ttc : ' . $o->total_ttc->__toString() . '%' . PHP_EOL;
    echo PHP_EOL;
 }

Will output :

 Amount : 33
 Total Ht : $3 325.08
 Total Ttc : $3 990.10//exact is 3 990.096 but the scale is 2 sà 0.096 become 0.10
 
 Amount : 78
 Total Ht : $7 859.28
 Total Ttc : $9 431.14//exact is 9 431.136 but the scale is 2 sà 0.136 become 0.14