diff --git a/modules/swagger-codegen/src/main/resources/php/Swagger.mustache b/modules/swagger-codegen/src/main/resources/php/Swagger.mustache
index 1247be83f3f..03b73f5775a 100644
--- a/modules/swagger-codegen/src/main/resources/php/Swagger.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/Swagger.mustache
@@ -48,6 +48,18 @@ class APIClient {
     $this->headerValue = $headerValue;
   }
 
+  /**
+   * Set the user agent of the API client
+   *
+   *  @param string $user_agent The user agent of the API client
+   */
+  public function setUserAgent($user_agent) {
+    if (!is_string($user_agent)) {
+      throw new Exception('User-agent must be a string.');
+    }
+    $this->user_agent= $user_agent;
+  }
+
   /**
    *  @param integer $seconds Number of seconds before timing out [set to 0 for no timeout]
   */
@@ -58,7 +70,6 @@ class APIClient {
     $this->curl_timout = $seconds;
   }
 
-
   /**
    * @param string $resourcePath path to method endpoint
    * @param string $method method to call
@@ -121,6 +132,13 @@ class APIClient {
     }
     curl_setopt($curl, CURLOPT_URL, $url);
 
+    // Set user agent
+    if ($this->user_agent) {
+      curl_setopt($curl, CURLOPT_USERAGENT, $this->user_agent);
+    } else { // use PHP-Swagger as the default user agent
+      curl_setopt($curl, CURLOPT_USERAGENT, 'PHP-Swagger');
+    }
+
     // Make the request
     $response = curl_exec($curl);
     $response_info = curl_getinfo($curl);
diff --git a/samples/client/petstore/php/Swagger.php b/samples/client/petstore/php/Swagger.php
index 1247be83f3f..03b73f5775a 100644
--- a/samples/client/petstore/php/Swagger.php
+++ b/samples/client/petstore/php/Swagger.php
@@ -48,6 +48,18 @@ class APIClient {
     $this->headerValue = $headerValue;
   }
 
+  /**
+   * Set the user agent of the API client
+   *
+   *  @param string $user_agent The user agent of the API client
+   */
+  public function setUserAgent($user_agent) {
+    if (!is_string($user_agent)) {
+      throw new Exception('User-agent must be a string.');
+    }
+    $this->user_agent= $user_agent;
+  }
+
   /**
    *  @param integer $seconds Number of seconds before timing out [set to 0 for no timeout]
   */
@@ -58,7 +70,6 @@ class APIClient {
     $this->curl_timout = $seconds;
   }
 
-
   /**
    * @param string $resourcePath path to method endpoint
    * @param string $method method to call
@@ -121,6 +132,13 @@ class APIClient {
     }
     curl_setopt($curl, CURLOPT_URL, $url);
 
+    // Set user agent
+    if ($this->user_agent) {
+      curl_setopt($curl, CURLOPT_USERAGENT, $this->user_agent);
+    } else { // use PHP-Swagger as the default user agent
+      curl_setopt($curl, CURLOPT_USERAGENT, 'PHP-Swagger');
+    }
+
     // Make the request
     $response = curl_exec($curl);
     $response_info = curl_getinfo($curl);