fix(php,php-nextgen): remove useless string cast from ObjectSerializer.mustache (#22121)

Author: simPod

modules/openapi-generator/src/main/resources/php-nextgen/ObjectSerializer.mustache

@@ -579,6 +579,6 @@ class ObjectSerializer
             }
         }
 
-        return $qs ? (string) substr($qs, 0, -1) : '';
+        return $qs ? substr($qs, 0, -1) : '';
     }
 }

modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache

@@ -586,6 +586,6 @@ class ObjectSerializer
             }
         }
 
-        return $qs ? (string) substr($qs, 0, -1) : '';
+        return $qs ? substr($qs, 0, -1) : '';
     }
 }

samples/client/echo_api/php-nextgen-streaming/src/ObjectSerializer.php

@@ -588,6 +588,6 @@ public static function buildQuery(array $params, $encoding = PHP_QUERY_RFC3986):
             }
         }
 
-        return $qs ? (string) substr($qs, 0, -1) : '';
+        return $qs ? substr($qs, 0, -1) : '';
     }
 }

samples/client/echo_api/php-nextgen/src/ObjectSerializer.php

@@ -588,6 +588,6 @@ public static function buildQuery(array $params, $encoding = PHP_QUERY_RFC3986):
             }
         }
 
-        return $qs ? (string) substr($qs, 0, -1) : '';
+        return $qs ? substr($qs, 0, -1) : '';
     }
 }

samples/client/petstore/php-nextgen/OpenAPIClient-php/src/ObjectSerializer.php

@@ -587,6 +587,6 @@ public static function buildQuery(array $params, $encoding = PHP_QUERY_RFC3986):
             }
         }
 
-        return $qs ? (string) substr($qs, 0, -1) : '';
+        return $qs ? substr($qs, 0, -1) : '';
     }
 }

samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php

@@ -594,6 +594,6 @@ public static function buildQuery(array $params, $encoding = PHP_QUERY_RFC3986):
             }
         }
 
-        return $qs ? (string) substr($qs, 0, -1) : '';
+        return $qs ? substr($qs, 0, -1) : '';
     }
 }

samples/client/petstore/php/psr-18/lib/ObjectSerializer.php

@@ -594,6 +594,6 @@ public static function buildQuery(array $params, $encoding = PHP_QUERY_RFC3986):
             }
         }
 
-        return $qs ? (string) substr($qs, 0, -1) : '';
+        return $qs ? substr($qs, 0, -1) : '';
     }
 }