add json serialize (#16)

Author: Melvin Drost

composer.json

@@ -17,7 +17,8 @@
     ],
     "require": {
         "php": "^7.4|^8.0",
-        "ext-bcmath": "*"
+        "ext-bcmath": "*",
+        "ext-json": "*"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.0",

src/AbstractNumber.php

@@ -9,7 +9,7 @@
 use MadeByBob\Number\Exception\InvalidNumberInputTypeException;
 use MadeByBob\Number\Exception\InvalidRoundingModeException;
 
-abstract class AbstractNumber
+abstract class AbstractNumber implements \JsonSerializable
 {
     protected const INTERNAL_SCALE = 12;
     protected const DEFAULT_SCALE = 4;
@@ -541,6 +541,14 @@ public function __toString(): string
         return $this->toString();
     }
 
+    /**
+     * Converts the current MadeByBob\Number instance into a string.
+     */
+    public function jsonSerialize()
+    {
+        return $this->toString();
+    }
+
     /**
      * @internal Provides value with internal scale.
      */

tests/NumberTest.php

@@ -699,4 +699,13 @@ public function testFormatNumber(): void
         $number = new Number('5943.000000');
         $this->assertEquals('5.943', $number->format(0, 0));
     }
+
+    public function testCanJsonSerialize(): void
+    {
+        $number = new Number('9342.1557');
+        $array = ['number' => $number];
+
+        $this->assertEquals('{"number":"9342.1557"}', json_encode($array));
+        $this->assertEquals('"9342.1557"', json_encode($number));
+    }
 }