使用百度地图逆地址解析遇到的一个小坑

http://api.map.baidu.com/geocoder/v2/?ak=xxx&coordtype=wgs84ll&callback=renderReverse&location=37.58585,118.8889&output=xml&pois=1

用这个api解析得到的json值中会多出

renderReverse&&renderReverse({"status":0,"result":{"location":{"lng":119.95955778200993,"lat":31.745123739675667}，

renderReverse&&renderReverse这是什么鬼，拿到值很开心的用上json_decode,结果刷新查看返回NULL，竟然是空，不甘心的我以特么刷新了几遍，还是空，这是逗我吗？又跑去检查代码，代码没错啊。最后通过百度找到了正确的解决办法，原来是多了callback=renderReverse这个javascript函数名，去掉这个就行了。另一种方法是通过正则来匹配出json格式数据，

$str= 'renderReverse&&renderReverse({"status":0,"result":{"location":{"lng":116.32298703399,"lat":39.983424051248},"formatted_address":"北京市海淀区中关村大街27号1101-08室","business":"中关村,人民大学,苏州街","addressComponent":{"adcode":"110108","city":"北京市","country":"中国","direction":"附近","distance":"7","district":"海淀区","province":"北京市","street":"中关村大街","street_number":"27号1101-08室","country_code":0},"pois":[{"addr":"北京北京海淀海淀区中关村大街27号（地铁海淀黄庄站A1","cp":"NavInfo","direction":"内","distance":"0","name":"北京远景国际公寓(中关村店)","poiType":"房地产","point":{"x":116.3229458916,"y":39.983610361549},"tag":"房地产","tel":"","uid":"35a08504cb51b1138733049d","zip":""},{"addr":"海淀区中关村北大街27号","cp":"NavInfo","direction":"附近","distance":"25","name":"中关村大厦","poiType":"房地产","point":{"x":116.32285606105,"y":39.983568897877},"tag":"房地产;写字楼","tel":"","uid":"06d2dffdaef1b7ef88f15d04","zip":""},{"addr":"中关村大街29","cp":"NavInfo","direction":"北","distance":"62","name":"海淀医院激光整形美容部","poiType":"医疗","point":{"x":116.32317046798,"y":39.983016046485},"tag":"医疗;专科医院","tel":"","uid":"b1c556e81f27cb71b4265502","zip":""},{"addr":"中关村大街27号中关村大厦1层","cp":"NavInfo","direction":"附近","distance":"1","name":"中国人民财产保险中关村营业部","poiType":"金融","point":{"x":116.32298182382,"y":39.983416864194},"tag":"金融;投资理财","tel":"","uid":"060f5e53137d20d7081cc779","zip":""},{"addr":"北京市海淀区","cp":"NavInfo","direction":"东北","distance":"58","name":"北京市海淀医院-输血科","poiType":"医疗","point":{"x":116.322685383,"y":39.983092063819},"tag":"医疗;其他","tel":"","uid":"cf405905b6d82eb9b55f1e89","zip":""},{"addr":"北京市海淀区中关村大街27号中关村大厦二层","cp":"NavInfo","direction":"附近","distance":"0","name":"眉州东坡酒楼(中关村店)","poiType":"美食","point":{"x":116.32298182382,"y":39.983423774823},"tag":"美食","tel":"","uid":"2c0bd6c57dbdd3b342ab9a8c","zip":""},{"addr":"北京市海淀区中关村大街29号（海淀黄庄路口）","cp":"NavInfo","direction":"东北","distance":"223","name":"海淀医院","poiType":"医疗","point":{"x":116.32199368776,"y":39.982083099537},"tag":"医疗;综合医院","tel":"","uid":"fa01e9371a040053774ff1ca","zip":""},{"addr":"北京市海淀区中关村大街28号","cp":"NavInfo","direction":"西北","distance":"229","name":"海淀剧院","poiType":"休闲娱乐","point":{"x":116.32476945179,"y":39.982622137118},"tag":"休闲娱乐;电影院","tel":"","uid":"edd64ce1a6d799913ee231b3","zip":""},{"addr":"海淀黄庄地铁站旁","cp":"NavInfo","direction":"西北","distance":"375","name":"中发电子市场(中关村大街)","poiType":"购物","point":{"x":116.32529945204,"y":39.981537146849},"tag":"购物;家电数码","tel":"","uid":"69130523db34c811725e8047","zip":""},{"addr":"北京市海淀区知春路128号","cp":"NavInfo","direction":"西北","distance":"434","name":"泛亚大厦","poiType":"房地产","point":{"x":116.32600013033,"y":39.981516414381},"tag":"房地产;写字楼","tel":"","uid":"d24e48ebb9991cc9afee7ade","zip":""}],"poiRegions":[],"sematic_description":"北京远景国际公寓(中关村店)内0米","cityCode":131}})';

preg_match('/\(.*\)/', $str, $result);
var_dump($result);

第三办法是用str_replace和substr和strlen解决，这里就不给出具体的写法了，有需要的可以去百度一下用法。