in_array() codeginter PHP

Question

hello members a anomaly in codeigniter im noticing

in my model im querying the database to get a list of user_id ONLY

$recs = $this->db->query('select id from users');

that was easy, but i want to return the result as an array

so i do

$reccs->result_array();

but now in my controller i want to check for in_array(124,$returned_array); this is not successful because codeigniter has encapsulated the array of id into av big outer array something like this

Array ( [0] => Array ( [id] => 0 ) [1] => Array ( [id] => 11 )           [2]  =>   Array ( [id] => 29 )) 

how can i use the in_array php function to check only id ?

OR

how can i built a plain array just to store id something like

 $demo = array();
 foreach($recs as $r)
 $demo = array($r->id);

Any suggestions ?

Answer 1

If you want to check whether user is there or not you should make a count query.

$this->db->where('id',124);
$count = $this->db->count_all_results('users');

if($count) {
// found
} else {
// not found
}

Answer 2

正如其他评论所说，有更好的方法可以做到这一点但是你坚持这样做，只需将id转换为数组以匹配结果数组结构：

in_array(array('id' => 124),$returned_array)

Answer 3

You can loop the result set and generate a ne w array and make use of it. Below is the code which may be usefull

$i=0;
foreach($reccs->result_array() as $values)
{
$new_array[]=$values[$i]['id'];
$i++;
}

make use of $new_array for in_array comparision

Answer 4

You could use array_map() to pluck that key from each sub array. Then, in_array() will work as per normal.

$found = in_array(124, 
                  array_map(function($val) { return $val['id']; },
                            $returned_array
                  )
         );

If you don't have >= PHP 5.3, then replace the anonymous function with a named one.