将PHP二维数组提取出自己想要的信息

Question

原二维数组，信息很多array(size=16)'id'=>string'64'(length=2)'user_id'=>string'64'(length=2)'doc_id'=>string'121'(length=3)'time'=>string'2015-08-0711:41:28'(length=19)'email'=>string'[e-mail]'(length=17)'username'=>string'孙策'(length=6)'password'=>string'18bc4215375cd9773a5f572934018bfa'(length=32)'phone'=>string'456181687'(length=9)'category'=>string'2'(length=1)'company'=>string'东吴集团'(length=12)'name'=>string'孙策'(length=6)'position'=>string'我被社长干死了'(length=21)'address'=>string'建康'(length=6)'state'=>string'3'(length=1)'other_field'=>null'authentication'=>string'1'(length=1)array(size=16)'id'=>string'65'(length=2)'user_id'=>string'65'(length=2)'doc_id'=>string'121'(length=3)'time'=>string'2015-08-1104:27:08'(length=19)'email'=>string'[e-mail]'(length=17)'username'=>string'刘封'(length=6)'password'=>string'18bc4215375cd9773a5f572934018bfa'(length=32)'phone'=>string''(length=0)'category'=>string'0'(length=1)'company'=>string'蜀汉'(length=6)'name'=>string'刘封'(length=6)'position'=>string'备胎'(length=6)'address'=>string'荆州阿萨斯'(length=15)'state'=>string'2'(length=1)'other_field'=>null'authentication'=>string'1'(length=1)现在只需要email，company，name，phone这四个值，怎么操作？array(size=16)'email'=>string'[e-mail]'(length=17)'phone'=>string'456181687'(length=9)'company'=>string'东吴集团'(length=12)'name'=>string'孙策'(length=6)array(size=16)'email'=>string'[e-mail]'(length=17)'phone'=>string''(length=0)'company'=>string'蜀汉'(length=6)'name'=>string'刘封'(length=6)

Answer 1

$keys=array(email，company，name，phone);foreach下原数组，if（！in_array($key,$keys)）,unset掉
                            

Answer 2

$result=array_map(function($value){
return['email'=>$value['email'],'company'=>$value['company'],'name'=>$value['name'],'phone'=>$value['phone']];
},$arr);
var_dump($result);