$name='张三,李四,吴五';
$gname='教室一,教室二,教室三';
$phone='130,131,132';
这是三个字符串，转化为下列数组格式：
[{"name":"张三","gname":"教室一","phone":"130"},{"name":"李四","gname":"教室二","phone":"131"},{"name":"吴五","gname":"教室三","phone":"132"}]
先用explode把这三个转成数组，然后组合就好了
explode(',',$name);就可以转为数组了；不过看你这结果应该是json数组，再json_encocde一下