今天在使用php时掉进了一个坑里，折腾了好久。 在使用json_encode时，如果数组中存在中文，该中文输出为null。 示例代码：
<?<span php
</span><span $brand</span> = <span array</span>('id'=>'123456','name'=>'联想'<span );
</span><span var_dump</span>(json_encode(<span $brand</span><span ));
</span>?>输出结果：
<span string</span>(27) "{"id":"123456","name":null}"<?<span php
</span><span function</span> gbk2utf8(<span $data</span><span ){
</span><span if</span>(<span is_array</span>(<span $data</span><span )){
</span><span return</span> <span array_map</span>('gbk2utf8', <span $data</span><span );
}
</span><span return</span> <span iconv</span>('gbk','utf-8',<span $data</span><span );
}
</span>?><?<span php
</span><span $brand</span> = <span array</span>('id'=>'123456','name'=>'联想'<span );
</span><span var_dump</span>(json_encode(gbk2utf8(<span $brand</span><span )));
</span>?>在json_encode之前做一下gbk2utf8转码，此时输出正确结果。
<span string</span>(37) "{"id":"123456","name":"\u8054\u60f3"}"\u8054\u60f3 为“联想”的unicode码，浏览器会自动转换成文字。
