解决php json_encode中文转码、乱码问题

<?php
// 防止json中文转码
function jsonEncodeWithCN($data) {
    return preg_replace("/u([0-9a-f]{4})/ie", "iconv('UCS-2BE', 'UTF-8', pack('H4', '$1'))", json_encode($data));
}

$arr = array('a'=>'测试', b=>'hello');

echo jsonEncodeWithCN($arr);