Fix

src/Utils/Decimal.php

@@ -15,17 +15,22 @@ use Illuminate\Support\Arr;
 class Decimal
 {
     protected $source;
-    protected $dp = 20;
+    protected $dp;
+
+    // Rounds away from zero.
     const ROUND_UP = 0;
+    // Rounds towards zero.
     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($v)
@@ -42,7 +47,7 @@ class Decimal
     function __call($name, $arguments)
     {
         $methods = ['add', 'sub', 'mul', 'div'];
-        if (Arr::has($methods, $name)) {
+        if (in_array($name, $methods)) {
             $method = "bc$name";
             $v = new Decimal($arguments[0]);
             return new Decimal($method($this->source, $v->getSource()));
@@ -51,9 +56,19 @@ class Decimal
         throw new \Exception("method $name not found.");
     }
 
+    function __toString(): string
+    {
+        return $this->source;
+    }
+
     function equals($v): bool
     {
-        return (new Decimal($v))->getSource() == $this->source;
+        return (new Decimal($v))->getSource() == new Decimal($this->source);
+    }
+
+    function toDecimalPlaces(int $dp, int $rm = self::ROUND_UP): Decimal
+    {
+        return new Decimal($this->toFixed($dp, $rm), $dp);
     }
 
     function toFixed(int $dp, int $rm = self::ROUND_UP): string