Add __toString and toDecimalPlaces method.

src/Utils/Decimal.php

@@ -15,17 +15,19 @@ use Illuminate\Support\Arr;
 class Decimal
 {
     protected $source;
-    protected $dp = 20;
+    protected $dp;
     const ROUND_UP = 0;
     const ROUND_DOWN = 1;
 
-    function __construct($v)
+    function __construct($v, int $dp = 8)
     {
         if (!$this->isNumeric($v)) {
             throw new \Exception("value type must be int|float|string|Decimal.");
         }
 
-        $this->source = ($v instanceof Decimal) ? $v->getSource() : bcadd($v, 0, $this->dp);
+        $this->dp = $dp;
+        $val = $v instanceof Decimal ? $v->getSource() : $v;
+        $this->source = bcadd($val, "0", $dp);
     }
 
     private function isNumeric($v)
@@ -51,11 +53,21 @@ class Decimal
         throw new \Exception("method $name not found.");
     }
 
+    function __toString(): string
+    {
+        return $this->source;
+    }
+
     function equals($v): bool
     {
         return (new Decimal($v))->getSource() == $this->source;
     }
 
+    function toDecimalPlaces(int $dp)
+    {
+        return new Decimal($this->source, $dp);
+    }
+
     function toFixed(int $dp, int $rm = self::ROUND_UP): string
     {
         if ($rm == self::ROUND_UP) {