json_encode返回NULL？

如何解决json_encode返回NULL？

我敢打赌，您正在以非utf8编码检索数据：请尝试MysqL_query('SET CHaraCTER SET utf8')在SELECT查询之前输入。

解决方法

由于某种原因，“描述”项将返回NULL以下代码：

<?php
include('db.php');

$result = mysql_query('SELECT * FROM `staff` ORDER BY `id` DESC LIMIT 2') or die(mysql_error());
$rows = array();
while($row = mysql_fetch_assoc($result)){
    $rows[] = $row;
}

echo json_encode($rows);
?>

这是我的数据库的架构：

CREATE TABLE `staff` (
  `id` int(11) NOT NULL AUTO_INCREMENT,`name` longtext COLLATE utf8_unicode_ci,`description` longtext COLLATE utf8_unicode_ci,`icon` longtext COLLATE utf8_unicode_ci,`date` longtext COLLATE utf8_unicode_ci,`company` longtext COLLATE utf8_unicode_ci,`companyurl` longtext COLLATE utf8_unicode_ci,`appurl` longtext COLLATE utf8_unicode_ci,PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=5 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

这是页面上呼应的内容：

[{"id":"4","name":"Noter 2","description":null,"icon":"http:\/\/images.apple.com\/webapps\/productivity\/images\/noter2_20091223182720-thumb.jpg","date":"1262032317","company":"dBelement,LLC","companyurl":"http:\/\/dbelement.com\/","appurl":"http:\/\/noter2.dbelement.com"},{"id":"3","appurl":"http:\/\/noter2.dbelement.com"}]

有任何想法吗？