diff --git a/modules/swagger-codegen/src/main/resources/php/model.mustache b/modules/swagger-codegen/src/main/resources/php/model.mustache
index 146809eeb99..ac08ed699b2 100644
--- a/modules/swagger-codegen/src/main/resources/php/model.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/model.mustache
@@ -163,39 +163,39 @@ class {{classname}} {{#parentSchema}}extends {{{parent}}} {{/parentSchema}}imple
         {{#vars}}
         {{#required}}
         if ($this->container['{{name}}'] === null) {
-            $invalid_properties[] = "'${{name}}' can't be null";
+            $invalid_properties[] = "'{{name}}' can't be null";
         }
         {{/required}}
         {{#isEnum}}
         $allowed_values = array({{#allowableValues}}{{#values}}"{{{this}}}"{{^-last}}, {{/-last}}{{/values}}{{/allowableValues}});
         if (!in_array($this->container['{{name}}'], $allowed_values)) {
-            $invalid_properties[] = "invalid value for '${{name}}', must be one of #{allowed_values}.";
+            $invalid_properties[] = "invalid value for '{{name}}', must be one of #{allowed_values}.";
         }
         {{/isEnum}}
         {{#hasValidation}}
         {{#maxLength}}
         if (strlen($this->container['{{name}}']) > {{maxLength}}) {
-            $invalid_properties[] = "invalid value for '${{name}}', the character length must be smaller than or equal to {{{maxLength}}}.";
+            $invalid_properties[] = "invalid value for '{{name}}', the character length must be smaller than or equal to {{{maxLength}}}.";
         }
         {{/maxLength}}
         {{#minLength}}
         if (strlen($this->container['{{name}}']) < {{minLength}}) {
-            $invalid_properties[] = "invalid value for '${{name}}', the character length must be bigger than or equal to {{{minLength}}}.";
+            $invalid_properties[] = "invalid value for '{{name}}', the character length must be bigger than or equal to {{{minLength}}}.";
         }
         {{/minLength}}
         {{#maximum}}
         if ($this->container['{{name}}'] > {{maximum}}) {
-            $invalid_properties[] = "invalid value for '${{name}}', must be smaller than or equal to {{maximum}}.";
+            $invalid_properties[] = "invalid value for '{{name}}', must be smaller than or equal to {{maximum}}.";
         }
         {{/maximum}}
         {{#minimum}}
         if ($this->container['{{name}}'] < {{minimum}}) {
-            $invalid_properties[] = "invalid value for '${{name}}', must be bigger than or equal to {{minimum}}.";
+            $invalid_properties[] = "invalid value for '{{name}}', must be bigger than or equal to {{minimum}}.";
         }
         {{/minimum}}
         {{#pattern}}
         if (!preg_match("{{pattern}}", $this->container['{{name}}'])) {
-            $invalid_properties[] = "invalid value for '${{name}}', must be conform to the pattern {{pattern}}.";
+            $invalid_properties[] = "invalid value for '{{name}}', must be conform to the pattern {{pattern}}.";
         }
         {{/pattern}}
         {{/hasValidation}}
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
index baae3dc0551..732153c3aab 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
@@ -139,7 +139,7 @@ class Animal implements ArrayAccess
     {
         $invalid_properties = array();
         if ($this->container['class_name'] === null) {
-            $invalid_properties[] = "'$class_name' can't be null";
+            $invalid_properties[] = "'class_name' can't be null";
         }
         return $invalid_properties;
     }
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php
index 4353a951d5d..cb2ce24988b 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php
@@ -174,15 +174,15 @@ class EnumTest implements ArrayAccess
         $invalid_properties = array();
         $allowed_values = array("UPPER", "lower");
         if (!in_array($this->container['enum_string'], $allowed_values)) {
-            $invalid_properties[] = "invalid value for '$enum_string', must be one of #{allowed_values}.";
+            $invalid_properties[] = "invalid value for 'enum_string', must be one of #{allowed_values}.";
         }
         $allowed_values = array("1", "-1");
         if (!in_array($this->container['enum_integer'], $allowed_values)) {
-            $invalid_properties[] = "invalid value for '$enum_integer', must be one of #{allowed_values}.";
+            $invalid_properties[] = "invalid value for 'enum_integer', must be one of #{allowed_values}.";
         }
         $allowed_values = array("1.1", "-1.2");
         if (!in_array($this->container['enum_number'], $allowed_values)) {
-            $invalid_properties[] = "invalid value for '$enum_number', must be one of #{allowed_values}.";
+            $invalid_properties[] = "invalid value for 'enum_number', must be one of #{allowed_values}.";
         }
         return $invalid_properties;
     }
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
index 837cff5ff1f..4e456262f6c 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
@@ -190,55 +190,55 @@ class FormatTest implements ArrayAccess
     {
         $invalid_properties = array();
         if ($this->container['integer'] > 100.0) {
-            $invalid_properties[] = "invalid value for '$integer', must be smaller than or equal to 100.0.";
+            $invalid_properties[] = "invalid value for 'integer', must be smaller than or equal to 100.0.";
         }
         if ($this->container['integer'] < 10.0) {
-            $invalid_properties[] = "invalid value for '$integer', must be bigger than or equal to 10.0.";
+            $invalid_properties[] = "invalid value for 'integer', must be bigger than or equal to 10.0.";
         }
         if ($this->container['int32'] > 200.0) {
-            $invalid_properties[] = "invalid value for '$int32', must be smaller than or equal to 200.0.";
+            $invalid_properties[] = "invalid value for 'int32', must be smaller than or equal to 200.0.";
         }
         if ($this->container['int32'] < 20.0) {
-            $invalid_properties[] = "invalid value for '$int32', must be bigger than or equal to 20.0.";
+            $invalid_properties[] = "invalid value for 'int32', must be bigger than or equal to 20.0.";
         }
         if ($this->container['number'] === null) {
-            $invalid_properties[] = "'$number' can't be null";
+            $invalid_properties[] = "'number' can't be null";
         }
         if ($this->container['number'] > 543.2) {
-            $invalid_properties[] = "invalid value for '$number', must be smaller than or equal to 543.2.";
+            $invalid_properties[] = "invalid value for 'number', must be smaller than or equal to 543.2.";
         }
         if ($this->container['number'] < 32.1) {
-            $invalid_properties[] = "invalid value for '$number', must be bigger than or equal to 32.1.";
+            $invalid_properties[] = "invalid value for 'number', must be bigger than or equal to 32.1.";
         }
         if ($this->container['float'] > 987.6) {
-            $invalid_properties[] = "invalid value for '$float', must be smaller than or equal to 987.6.";
+            $invalid_properties[] = "invalid value for 'float', must be smaller than or equal to 987.6.";
         }
         if ($this->container['float'] < 54.3) {
-            $invalid_properties[] = "invalid value for '$float', must be bigger than or equal to 54.3.";
+            $invalid_properties[] = "invalid value for 'float', must be bigger than or equal to 54.3.";
         }
         if ($this->container['double'] > 123.4) {
-            $invalid_properties[] = "invalid value for '$double', must be smaller than or equal to 123.4.";
+            $invalid_properties[] = "invalid value for 'double', must be smaller than or equal to 123.4.";
         }
         if ($this->container['double'] < 67.8) {
-            $invalid_properties[] = "invalid value for '$double', must be bigger than or equal to 67.8.";
+            $invalid_properties[] = "invalid value for 'double', must be bigger than or equal to 67.8.";
         }
         if (!preg_match("/[a-z]/i", $this->container['string'])) {
-            $invalid_properties[] = "invalid value for '$string', must be conform to the pattern /[a-z]/i.";
+            $invalid_properties[] = "invalid value for 'string', must be conform to the pattern /[a-z]/i.";
         }
         if ($this->container['byte'] === null) {
-            $invalid_properties[] = "'$byte' can't be null";
+            $invalid_properties[] = "'byte' can't be null";
         }
         if ($this->container['date'] === null) {
-            $invalid_properties[] = "'$date' can't be null";
+            $invalid_properties[] = "'date' can't be null";
         }
         if ($this->container['password'] === null) {
-            $invalid_properties[] = "'$password' can't be null";
+            $invalid_properties[] = "'password' can't be null";
         }
         if (strlen($this->container['password']) > 64) {
-            $invalid_properties[] = "invalid value for '$password', the character length must be smaller than or equal to 64.";
+            $invalid_properties[] = "invalid value for 'password', the character length must be smaller than or equal to 64.";
         }
         if (strlen($this->container['password']) < 10) {
-            $invalid_properties[] = "invalid value for '$password', the character length must be bigger than or equal to 10.";
+            $invalid_properties[] = "invalid value for 'password', the character length must be bigger than or equal to 10.";
         }
         return $invalid_properties;
     }
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
index 0806859dd8e..4caea36ff6d 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
@@ -145,7 +145,7 @@ class Name implements ArrayAccess
     {
         $invalid_properties = array();
         if ($this->container['name'] === null) {
-            $invalid_properties[] = "'$name' can't be null";
+            $invalid_properties[] = "'name' can't be null";
         }
         return $invalid_properties;
     }
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
index 6e33b76614e..6d7d227dd11 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
@@ -167,7 +167,7 @@ class Order implements ArrayAccess
         $invalid_properties = array();
         $allowed_values = array("placed", "approved", "delivered");
         if (!in_array($this->container['status'], $allowed_values)) {
-            $invalid_properties[] = "invalid value for '$status', must be one of #{allowed_values}.";
+            $invalid_properties[] = "invalid value for 'status', must be one of #{allowed_values}.";
         }
         return $invalid_properties;
     }
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
index 21212173374..83e3c2b325f 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
@@ -166,14 +166,14 @@ class Pet implements ArrayAccess
     {
         $invalid_properties = array();
         if ($this->container['name'] === null) {
-            $invalid_properties[] = "'$name' can't be null";
+            $invalid_properties[] = "'name' can't be null";
         }
         if ($this->container['photo_urls'] === null) {
-            $invalid_properties[] = "'$photo_urls' can't be null";
+            $invalid_properties[] = "'photo_urls' can't be null";
         }
         $allowed_values = array("available", "pending", "sold");
         if (!in_array($this->container['status'], $allowed_values)) {
-            $invalid_properties[] = "invalid value for '$status', must be one of #{allowed_values}.";
+            $invalid_properties[] = "invalid value for 'status', must be one of #{allowed_values}.";
         }
         return $invalid_properties;
     }