官方文档: http://lbsyun.baidu.com/index.php?title=webapi/guide/changeposition
$coords = '114.21892734521,29.575429778924'; // 需转换的源坐标，多组坐标以“；”分隔
$from = 1; // 源坐标类型，参考官方文档
$to = 5; // 目标坐标类型，5：bd09ll(百度经纬度坐标)，6：bd09mc(百度米制经纬度坐标)
$webApi->coords_convert->get($coords, $from, $to);
$coords参数支持数组类型: [‘114.2181,29.5754’, ‘114.2189,29.5754’, ‘114.2189,29.5754’]
返回结果示例:
{
"status":0,
"result":[
{
"x":114.2307519546763,
"y":29.57908428837437
}
]
}