将关联数组从mysqli_fetch_all的结果转换为简单的索引数组

Question

I have code like this

 $years_of_service = mysqli_query($mysqli, "SELECT YEAR(curdate())-Year_Entry FROM result");

 $result = mysqli_fetch_all($years_of_service,MYSQLI_NUM);

When i try to echo that result to see what happened with that code, i found this kind of array

Array ( [0] => Array ( [0] => 25 ) [1] => Array ( [0] => 25 ) [2] => Array ( [0] => 25 ) [3] => Array ( [0] => 25 ) [4] => Array ( [0] => 25 ) [5] => Array ( [0] => 14 ) [6] => Array ( [0] => 14 ) [7] => Array ( [0] => 14 ) [8] => Array ( [0] => 14 ) [9] => Array ( [0] => 14 ) [10] => Array ( [0] => 12 ) [11] => Array ( [0] => 12 ) [12] => Array ( [0] => 12 ) [13] => Array ( [0] => 12 ) [14] => Array ( [0] => 12 ) [15] => Array ( [0] => 11 ) [16] => Array ( [0] => 11 ) [17] => Array ( [0] => 11 ) [18] => Array ( [0] => 11 ) [19] => Array ( [0] => 11 ) [20] => Array ( [0] => 10 ) [21] => Array ( [0] => 10 ) [22] => Array ( [0] => 10 ) [23] => Array ( [0] => 10 ) [24] => Array ( [0] => 10 ) [25] => Array ( [0] => 9 ) [26] => Array ( [0] => 9 ) [27] => Array ( [0] => 9 ) [28] => Array ( [0] => 9 ) [29] => Array ( [0] => 8 ) [30] => Array ( [0] => 8 ) [31] => Array ( [0] => 8 ) [32] => Array ( [0] => 8 ) [33] => Array ( [0] => 7 ) [34] => Array ( [0] => 7 ) [35] => Array ( [0] => 7 ) [36] => Array ( [0] => 7 ) [37] => Array ( [0] => 6 ) [38] => Array ( [0] => 6 ) [39] => Array ( [0] => 6 ) [40] => Array ( [0] => 6 ) [41] => Array ( [0] => 6 ) [42] => Array ( [0] => 6 ) [43] => Array ( [0] => 6 ) [44] => Array ( [0] => 6 ) [45] => Array ( [0] => 6 ) [46] => Array ( [0] => 5 ) [47] => Array ( [0] => 5 ) [48] => Array ( [0] => 5 ) [49] => Array ( [0] => 5 ) [50] => Array ( [0] => 5 ) [51] => Array ( [0] => 5 ) [52] => Array ( [0] => 5 ) [53] => Array ( [0] => 5 ) [54] => Array ( [0] => 5 ) [55] => Array ( [0] => 4 ) [56] => Array ( [0] => 4 ) [57] => Array ( [0] => 4 ) [58] => Array ( [0] => 4 ) [59] => Array ( [0] => 4 ) [60] => Array ( [0] => 4 ) [61] => Array ( [0] => 4 ) [62] => Array ( [0] => 4 ) [63] => Array ( [0] => 4 ) [64] => Array ( [0] => 4 ) [65] => Array ( [0] => 4 ) [66] => Array ( [0] => 4 ) [67] => Array ( [0] => 4 ) [68] => Array ( [0] => 4 ) [69] => Array ( [0] => 3 ) [70] => Array ( [0] => 3 ) [71] => Array ( [0] => 3 ) [72] => Array ( [0] => 3 ) [73] => Array ( [0] => 3 ) [74] => Array ( [0] => 3 ) [75] => Array ( [0] => 3 ) [76] => Array ( [0] => 3 ) [77] => Array ( [0] => 3 ) [78] => Array ( [0] => 2 ) [79] => Array ( [0] => 2 ) [80] => Array ( [0] => 2 ) [81] => Array ( [0] => 2 ) [82] => Array ( [0] => 1 ) [83] => Array ( [0] => 1 ) [84] => Array ( [0] => 1 ) [85] => Array ( [0] => 1 ) [86] => Array ( [0] => 0 ) [87] => Array ( [0] => 0 ) [88] => Array ( [0] => 0 ) [89] => Array ( [0] => 0 ) )

I want to make it become a simple array containing only its value like

Array(25,25,25,....)

What is the best approach i can use. I've tried to make it simple array with this

$simple = array_values($result);

But it did'nt work. It show the same output with $result. I will use it for map and reduce function to categorize years of service by specific range.

Answer 1

The reason this is happening is you're retrieving all rows (outer array) which are being returned as an array of columns (the inner arrays).

What you need to do is loop through the rows:

$years_of_service = mysqli_query($mysqli, "SELECT YEAR(curdate())-Year_Entry FROM result");
$result = mysqli_fetch_all($work_period,MYSQLI_NUM);

$data = [];
foreach ($result as $row) {
    $data[] = $row[0];
}

Your array will now be 'flat':

$data => [
    0 => 25,
    1 => 24,
    ...
];

which will now return what you want when you use array_values:

$simple = array_values($data); // $simple will now equal Array(25, 24, ...)