let serializer implements Stringable

Author: Art4

docs/usage.md

@@ -598,7 +598,7 @@ Using this methods you can use every Redmine API endpoint. The following example
 ```php
 $client->requestPut(
     '/projects/1.xml',
-    \Redmine\Serializer\XmlSerializer::createFromArray([
+    (string) \Redmine\Serializer\XmlSerializer::createFromArray([
         'project' => [
             'name' => 'renamed project',
             'custom_fields' => [
@@ -610,7 +610,7 @@ $client->requestPut(
                 ],
             ],
         ]
-    ])->getEncoded()
+    ])
 );
 ```
 
@@ -620,7 +620,7 @@ Or to fetch data with complex query parameters you can use `requestGet()` with t
 
 ```php
 $client->requestGet(
-    \Redmine\Serializer\PathSerializer::create(
+    (string) \Redmine\Serializer\PathSerializer::create(
         '/time_entries.json',
         [
             'f' => ['spent_on'],
@@ -632,7 +632,7 @@ $client->requestGet(
                 ],
             ],
         ],
-    )->getPath()
+    )
 );
 ```
 

src/Redmine/Serializer/JsonSerializer.php

@@ -4,11 +4,12 @@
 
 use JsonException;
 use Redmine\Exception\SerializerException;
+use Stringable;
 
 /**
  * JsonSerializer.
  */
-final class JsonSerializer
+final class JsonSerializer implements Stringable
 {
     /**
      * @throws SerializerException if $data is not valid JSON
@@ -55,6 +56,11 @@ public function getEncoded(): string
         return $this->encoded;
     }
 
+    public function __toString(): string
+    {
+        return $this->getEncoded();
+    }
+
     private function decode(string $encoded): void
     {
         $this->encoded = $encoded;

src/Redmine/Serializer/PathSerializer.php

@@ -2,10 +2,12 @@
 
 namespace Redmine\Serializer;
 
+use Stringable;
+
 /**
- * PathSerializer.
+ * PathSerializer to handle query parameters.
  */
-final class PathSerializer
+final class PathSerializer implements Stringable
 {
     public static function create(string $path, array $queryParams = []): self
     {
@@ -38,4 +40,9 @@ public function getPath(): string
 
         return $this->path.$queryString;
     }
+
+    public function __toString(): string
+    {
+        return $this->getPath();
+    }
 }

src/Redmine/Serializer/XmlSerializer.php

@@ -5,12 +5,13 @@
 use JsonException;
 use Redmine\Exception\SerializerException;
 use SimpleXMLElement;
+use Stringable;
 use Throwable;
 
 /**
  * XmlSerializer.
  */
-final class XmlSerializer
+final class XmlSerializer implements Stringable
 {
     /**
      * @throws SerializerException if $data is not valid XML
@@ -59,6 +60,11 @@ public function getEncoded(): string
         return $this->encoded;
     }
 
+    public function __toString(): string
+    {
+        return $this->getEncoded();
+    }
+
     private function deserialize(string $encoded): void
     {
         $this->encoded = $encoded;