Fixed bug that the value of ttl will be converted to 0 when you don't set it. (#3301)

Co-authored-by: 李铭昕 <715557344@qq.com>

CHANGELOG-2.1.md

@@ -1,5 +1,9 @@
 # v2.1.8 - TBD
 
+## Fixed 
+
+- [#3301](https://github.com/hyperf/hyperf/pull/3301) Fixed bug that the value of ttl will be converted to 0 when you don't set it for `hyperf/cache`.
+
 # v2.1.7 - 2021-02-22
 
 ## Fixed

src/cache/src/Annotation/CachePut.php

@@ -30,7 +30,7 @@ class CachePut extends AbstractAnnotation
     public $value;
 
     /**
-     * @var int
+     * @var null|int
      */
     public $ttl;
 
@@ -48,7 +48,9 @@ class CachePut extends AbstractAnnotation
     public function __construct($value = null)
     {
         parent::__construct($value);
-        $this->ttl = (int) $this->ttl;
+        if ($this->ttl !== null) {
+            $this->ttl = (int) $this->ttl;
+        }
         $this->offset = (int) $this->offset;
     }
 }

src/cache/src/Annotation/Cacheable.php

@@ -32,7 +32,7 @@ class Cacheable extends AbstractAnnotation
     public $value;
 
     /**
-     * @var int
+     * @var null|int
      */
     public $ttl;
 
@@ -60,7 +60,9 @@ class Cacheable extends AbstractAnnotation
     public function __construct($value = null)
     {
         parent::__construct($value);
-        $this->ttl = (int) $this->ttl;
+        if ($this->ttl !== null) {
+            $this->ttl = (int) $this->ttl;
+        }
         $this->offset = (int) $this->offset;
     }
 

src/cache/tests/Cases/AnnotationTest.php

@@ -52,6 +52,22 @@ class AnnotationTest extends TestCase
         $this->assertSame('test', $annotation->prefix);
         $this->assertSame(3600, $annotation->ttl);
         $this->assertSame(100, $annotation->offset);
+
+        $annotation = new Cacheable([
+            'prefix' => 'test',
+            'ttl' => null,
+        ]);
+
+        $this->assertSame('test', $annotation->prefix);
+        $this->assertSame(null, $annotation->ttl);
+
+        $annotation = new CachePut([
+            'prefix' => 'test',
+            'ttl' => null,
+        ]);
+
+        $this->assertSame('test', $annotation->prefix);
+        $this->assertSame(null, $annotation->ttl);
     }
 
     public function testAnnotationManager()