php二维数组以某个字段做一维数组的键名

array_column 返回数组中指定的一列

array_column($input, NULL, $indexKey);

$input = [
    ["name"=>"tom", "age"=>"15"],
    ["name"=>"jack", "age"=>"15"],
    ["name"=>"lilei", "age"=>"15"], 
];
$data = array_column($input, NULL, "name");
var_dump($data);
//打印结果
array(3) {
  "tom" =>
  array(2) {
    "name" =>
    string(3) "tom"
    "age" =>
    string(2) "15"
  }
  "jack" =>
  array(2) {
    "name" =>
    string(4) "jack"
    "age" =>
    string(2) "15"
  }
  "lilei" =>
  array(2) {
    "name" =>
    string(5) "lilei"
    "age" =>
    string(2) "15"
  }
}