[11.x] Add setters to cache stores (#50912)

* Add setPrefix() to ApcStore and DatabaseStore

* Add setDirectory() setter to FileStore

src/Illuminate/Cache/ApcStore.php

@@ -123,4 +123,15 @@ public function getPrefix()
     {
         return $this->prefix;
     }
+
+    /**
+     * Set the cache key prefix.
+     *
+     * @param  string  $prefix
+     * @return void
+     */
+    public function setPrefix($prefix)
+    {
+        $this->prefix = $prefix;
+    }
 }

src/Illuminate/Cache/DatabaseStore.php

@@ -387,6 +387,17 @@ public function getPrefix()
         return $this->prefix;
     }
 
+    /**
+     * Set the cache key prefix.
+     *
+     * @param  string  $prefix
+     * @return void
+     */
+    public function setPrefix($prefix)
+    {
+        $this->prefix = $prefix;
+    }
+
     /**
      * Serialize the given value.
      *

src/Illuminate/Cache/FileStore.php

@@ -380,6 +380,19 @@ public function getDirectory()
         return $this->directory;
     }
 
+    /**
+     * Set the working directory of the cache.
+     *
+     * @param  string  $directory
+     * @return $this
+     */
+    public function setDirectory($directory)
+    {
+        $this->directory = $directory;
+
+        return $this;
+    }
+
     /**
      * Set the cache directory where locks should be stored.
      *