fix: Has method could invoke array_key_exists on not array variable

phpunit.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit colors="true">
+<phpunit colors="true" failOnWarning="true">
     <testsuites>
         <testsuite name="Complex">
             <directory suffix="Test.php">./test</directory>
@@ -13,4 +13,4 @@
             <directory suffix=".php">./src</directory>
         </whitelist>
     </filter>
-</phpunit>
+</phpunit>

src/Arr.php

@@ -158,7 +158,7 @@ public static function has(array $array, $keys): bool
         $tmp = $array;
 
         foreach ($keysArray as $key) {
-            if (!array_key_exists($key, $tmp)) {
+            if (!is_array($tmp) || !array_key_exists($key, $tmp)) {
                 return false;
             }
             $tmp = $tmp[$key];
@@ -1323,4 +1323,4 @@ public static function obj($array = []): ArrObj
     {
         return new ArrObj($array);
     }
-}
+}

test/Arr/ArrTest.php

@@ -37,6 +37,8 @@ public function testHas($class)
                 [
                     'test6' => 'def'
                 ],
+                'test7' => [],
+                'test8' => null,
             ],
         ];
 
@@ -53,6 +55,11 @@ public function testHas($class)
         $this->assertFalse($this->callMethod([$class, 'has'], $array, 'test2'));
         $this->assertFalse($this->callMethod([$class, 'has'], $array, 'test.test1'));
         $this->assertFalse($this->callMethod([$class, 'has'], $array, 'test.test2.test4'));
+
+        $this->assertFalse($this->callMethod([$class, 'has'], $array, 'test.test2.test3.foo'));
+        $this->assertFalse($this->callMethod([$class, 'has'], $array, 'test.test7.foo'));
+        $this->assertFalse($this->callMethod([$class, 'has'], $array, 'test.test8.foo'));
+        $this->assertFalse($this->callMethod([$class, 'has'], $array, '1.2.3'));
     }
 
     /**
@@ -1734,4 +1741,4 @@ public static function testStaticTwoArg($value, $key)
     {
         return $key < 3 && $value;
     }
-}
+}