PHP中的数组输出格式

Question

I am running SQL select query,getting the result in below format after executing the query.

Array
(
    [0] => Array
        (
            [usertype_id] => 14
        )

    [1] => Array
        (
            [usertype_id] => 15
        )

    [2] => Array
        (
            [usertype_id] => 17
        )

)

But i need result in below format

Array
(
    [0] => 14
    [1] => 15
    [2] => 17
)

So how to loop through this to get the output in above format.

Answer 1

array_column works just fine here:

https://3v4l.org/qX46k

<?php

$input = [['usertype_id' => 14], ['usertype_id' => 15], ['usertype_id' => 17]];
$expected = [14,15,17];

$result = array_column($input, 'usertype_id');

var_dump($result === $expected);

Output for 7.1.25 - 7.3.2

bool(true)

Answer 2

use array array_map()

$res= array_map(function($arr=array()){
    return $arr['usertype_id'];
},$input);
print_r($res);

Answer 3

If you are using PDO, then you can do as below

<?php
$sth = $dbh->prepare("SELECT usertype_id FROM user");
$sth->execute();

/* Fetch all of the values of the first column */
$result = $sth->fetchAll(PDO::FETCH_COLUMN, 0);
print_r($result);
?>

Reference: http://php.net/manual/en/pdostatement.fetchall.php