php 修改資料中某個元素值，其它元素值不變。循環數組

array(8) {
  [0] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(11)
    ["price"] => string(4) "0.10"
    ["controller"] => string(4) "Live"
    ["type_mold"] => int(1)
    ["img"] => string(0) ""
    ["description"] => string(4) "1212"
    ["title"] => string(12) "測試回放"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2020-01-25 15:03:14"
  }
  [1] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(10)
    ["price"] => string(4) "0.10"
    ["controller"] => string(4) "Live"
    ["type_mold"] => int(1)
    ["img"] => string(0) ""
    ["description"] => string(2) "12"
    ["title"] => string(12) "線上測試"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2019-10-17 15:03:14"
  }
  [2] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(3)
    ["price"] => string(4) "1.00"
    ["controller"] => string(4) "Live"
    ["type_mold"] => int(1)
    ["img"] => string(0) ""
    ["description"] => string(4) "1212"
    ["title"] => string(21) "測試保長時直播"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2019-10-17 15:03:14"
  }
  [3] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(2)
    ["price"] => string(4) "0.10"
    ["controller"] => string(5) "Video"
    ["type_mold"] => int(2)
    ["img"] => string(0) ""
    ["description"] => string(130) "最近長安剛剛公布了全新中型SUV CS85的預售價格，售價區間為14.99-17.19萬元，成為長安首款轎跑SUV。"
    ["title"] => string(142) "測試點播最近長安剛剛公布了全新中型SUV CS85的預售價格，售價區間為14.99-17.19萬元，成為長安首款轎跑SUV。"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2019-10-17 15:03:14"
  }
  [4] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(8)
    ["price"] => string(4) "0.00"
    ["controller"] => string(4) "Shop"
    ["type_mold"] => int(4)
    ["img"] => string(0) ""
    ["description"] => string(0) ""
    ["title"] => string(3) "111"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2019-10-17 15:03:14"
  }
  [5] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(61)
    ["price"] => string(4) "0.00"
    ["controller"] => string(9) "Testpaper"
    ["type_mold"] => int(3)
    ["img"] => string(45) "20190403/c378d2084ec9c3f05ceab36c00ac67a4.png"
    ["description"] => string(6) "健康"
    ["title"] => string(12) "健康管理"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2022-01-14 15:03:14"
  }
  [6] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(55)
    ["price"] => string(4) "0.00"
    ["controller"] => string(9) "Testpaper"
    ["type_mold"] => int(3)
    ["img"] => string(45) "20190330/af4db555769d71589ae163bfd0a3c05b.jpg"
    ["description"] => string(3) "111"
    ["title"] => string(27) "模闆導入試卷測試一"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2019-05-01 15:03:14"
  }
  [7] => array(10) {
    ["opid"] => int(0)
    ["pid"] => int(62)
    ["price"] => string(7) "1000.00"
    ["controller"] => string(9) "Testpaper"
    ["type_mold"] => int(3)
    ["img"] => string(45) "20190330/f1cc9c7df38108c505338a529e3d06a6.jpg"
    ["description"] => string(18) "法學概論201704"
    ["title"] => string(18) "法學概論201704"
    ["user_id"] => int(51)
    ["limit"] => string(19) "2019-07-29 15:03:14"
  }
}      

foreach($pid_arr_t as $key=>$value){
  $value['opid'] = 123;
  $pid_arr_t[$key] = $value;            
 }