取出json数据中的某一项组成一个数组？

Question

"jobs":[{"name":"iOS开发工程师","salary":"10k-15k","url":"www.baidu.com","desc":"广州","mark":"group:1"},{"name":"金融集团CEO","salary":"10k-15k","url":"www.baidu.com","desc":"北京","mark":"group:2"},{"name":"运维开发工程师","salary":"10k-15k","url":"www.baidu.com","desc":"上海","mark":"group:3"},{"name":"资深视觉设计师","salary":"10k-15k","url":"www.baidu.com","desc":"广州","mark":"group:4"}]怎么取出json数据中的mark这一项，例如我需要取group:4这个值得时候就可以用数组下标的方式，或者我怎么单独取出group：4这个数值？如果我想取出group后面的值呢，例如group：1取出1，用group的值组成一个数组。

Answer 1

$arr=json_decode($jobs);
for($i=0;$i$result[]=$arr[$i]['mark'];