json_encode并获取空值 – UTF-8问题

我正在尝试使用json_encode对对象数组进行编码，但如果它遇到像Ñ这样的特殊字符，它会为该字段提供一个空值。 我能够使用utf8_encode将2个字符串编码为uft8主要问题是我不能使用utf8_encode来编码数组。 你能帮我解决这个问题吗？

这是我的脚本：

Mysql查询

 $consulta = "SELECT id AS nrocliente, empresa, nombre, tipodoc, doc, email, tel, cel, nombrealt, calle, numero, piso, depto, localidad, prov, codpostal FROM envio_clientes"; $result = mysqli_query($db, $consulta); 

创建对象数组

 //Se crea un array con todos los resultados $cities = array(); while($row = mysqli_fetch_array($result,MYSQLI_ASSOC)) { $cities[] = array ( 'nrocliente' => $row['nrocliente'], 'empresa' => $row['empresa'], 'nombre' => $row['nombre'], 'tipodoc' => $row['tipodoc'], 'doc' => $row['doc'], 'email' => $row['email'], 'tel' => $row['tel'], 'cel' => $row['cel'], 'nombrealt' => $row['nombrealt'], 'calle' => $row['calle'], 'numero' => $row['numero'], 'piso' => $row['piso'], 'depto' => $row['depto'], 'localidad' => $row['localidad'], 'prov' => $row['prov'], 'codpostal' => $row['codpostal'] ); } 

获取jQuery自动完成术语

 // Cleaning up the term $term = trim(strip_tags($_GET['term'])); // Rudimentary search $matches = array(); 

创建一个稍后将由json_encode执行的新数组

 foreach($cities as $city){ if(stripos($city['nombre'], $term) !== false){ // Add the necessary "value" and "label" fields and append to result set $city['value'] = utf8_encode($city['nombre']); //$city['label'] = "{$city['nombre']} {$city['localidad']}, {$city['nrocliente']}"; $city['label'] = utf8_encode("{".$city['nombre']."} {".$city['localidad'] ."} {". $city['nrocliente']. "}"); $matches[] = $city; } } 

请注意：在上面的代码中， $city['label']和$city['value']使用utf8_encode处理得很好。

json_encode进程

 // Truncate, encode and return the results $matches = array_slice($matches, 0, 5); print json_encode($matches); ?> 

这就是我得到的回应：

 {"nrocliente":"2","empresa":"Medicas SRL","nombre":null,"tipodoc":"DNI","doc":"000000000","email":"","tel":"2223332222","cel":"","nombrealt":"","calle":"Av. Frey","numero":"222","piso":"","depto":"","localidad":"Capital","prov":"Santa Fe","codpostal":"3000","value":"Ivan \u00d1ibazeta","label":"{Ivan \u00d1ibazeta} {Capital} {2}"}] 

请注意：字段nombre为null，但value和label显示相当于Ñchar 。

我应该怎么做才能将utf8_encode应用于$cities数组或$matches数组？

提前致谢！