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 '2015-08-07 11:41:28' (length=19)

'email' => string 'yintx_123@163.com' (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 '2015-08-11 04:27:08' (length=19)

'email' => string 'yintx_121@163.com' (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 'yintx_123@163.com' (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 'yintx_121@163.com' (length=17)

'phone' => string '' (length=0)

'company' => string '蜀汉' (length=6)

'name' => string '刘封' (length=6)