added int3 to Reverse and test cases

exercises/Reverse/Complete/ReverseComplete.php

@@ -70,7 +70,7 @@ public static function int2(int $number): int
     {
         $revers = 0;
 
-        $sing = $number <=> 0;
+        $sign = $number <=> 0;
         $number = abs($number);
 
         $n = (int) log10($number) + 1;
@@ -82,6 +82,21 @@ public static function int2(int $number): int
             $revers += $numeral * pow(10, $i - 1);
         }
 
-        return $revers * $sing;
+        return $revers * $sign;
+    }
+
+    public static function int3(int $number): int
+    {
+        $reverse = 0;
+
+        $sign = $number <=> 0;
+        $number = abs($number);
+
+        while ($number > 0) {
+            $lastDigit = $number % 10;
+            $reverse = ($reverse * 10) + $lastDigit;
+            $number = (int) ($number / 10);
+        }
+        return $reverse * $sign;
     }
 }

tests/Reverse/Complete/ReverseCompleteTest.php

@@ -69,6 +69,36 @@ public function testCanReverseIntNegativeWithZeros2(): void
         self::assertSame(-21, ReverseComplete::int2(-120));
     }
 
+    public function testCanReverseIntZero3(): void
+    {
+        self::assertSame(0, ReverseComplete::int3(0));
+    }
+
+    public function testCanReverseInt3(): void
+    {
+        self::assertSame(21, ReverseComplete::int3(12));
+    }
+
+    public function testCanReverseIntWithThreeDigits3(): void
+    {
+        self::assertSame(321, ReverseComplete::int3(123));
+    }
+
+    public function testCanReverseIntZeros3(): void
+    {
+        self::assertSame(3, ReverseComplete::int3(300));
+    }
+
+    public function testCanReverseIntNegative3(): void
+    {
+        self::assertSame(-21, ReverseComplete::int3(-12));
+    }
+
+    public function testCanReverseIntNegativeWithZeros3(): void
+    {
+        self::assertSame(-21, ReverseComplete::int3(-120));
+    }
+
     public function testCanReverseString1(): void
     {
         self::assertSame('ytrewq', ReverseComplete::string1('qwerty'));