MySql NOT IN many values from the mysql fetched result - php

Question

I have 2 MySql queries which are interdependent.
My 'table1'
----------
id
----------
1
2
3
4
5
6
7
My First query
$sql1 = "SELECT * FROM table1 WHERE";// some condition which gives me id's 1,2,3
$res1=$obj->_executeQuery($sql1);
$res1=$obj->getAll($res1);
The result of this is giving me array
Array
(
[0] => Array
(
[id] => 1
..
..
)
[1] => Array
(
[id] => 2
..
..
)
[2] => Array
(
[id] => 3
..
..
)
)
I want to run another query on same 'table1', where not equal to list of ID's which i am getting from the first query.
My Second Query
$sql2 = "SELECT * FROM table1 WHERE id NOT IN (" . implode(',', $res1) . ")";
This is not showing me only one id i,e first. In above case i should get id's 4,5,6,7

Answer 1

Since implode will not give the desired value on multidimensional array so first you need to get the array of all id's to form one-dimensional array then use implode on the array of id's:
$id=array();
foreach ($res1 as $key=>$inner_array){
$id[]= $inner_array['id'];
}
you can use array_walk also here like this:
array_walk($res1,function($c) use (&$id) {$id[] = $c['id'];});
but i think the best one is array_map :
$id = array_map(function($i) {
return $i['id'];
}, $res1);
$sql2 = "SELECT * FROM table1 WHERE id NOT IN (" . implode(',', $id) . ")";
Note: when ever you are doing select please specify your column if you need few to select,unnecessarily selecting all will slow your sql processing.
suppose here:SELECT * FROM table1 WHERE, if you need only id then please select id only.

Answer 2

You have to change $res1, which is a two-dimensional array, into a one-dimensional array of IDs to be able to use implode:
$ids_from_first_query = array();
foreach($res1 as $result_row) {
$ids_from_first_query[] = $result_row['id'];
}
$ids_as_string = implode(',', $ids_from_first_query);
$sql2 = 'SELECT * FROM table1 WHERE id NOT IN(' . $ids_as_string . ')';
In the above code, $ids_as_string will look like this:
1,2,3
Thus it can be used in your MySQL query

Answer 3

Here you are getting two dimensional array so that's reason it is not working
while($each=mysql_fetch_array($res1))
{
$array[]=$each[id];
}
$imp=implode(",",$array);
$sql2 = "SELECT * FROM table1 WHERE id NOT IN (".$imp.")";
Try this it will works