Make an array from a select with multiple rows - php

Question

I'm trying my best here to find a solution for my issue, but with no luck.
I have a SELECT in my PHP to retrieve some products information like their IDs.
mysql_query("SELECT id_item FROM mytable WHERE status = '0' AND cond1 = '1' AND cond2 = '1'");
Every time I run this SELECT, I get 5 rows as result. After that I need to run a DELETE to kill those 5 rows using their id_item in my WHERE condition. When I run, manually, something like:
DELETE FROM mytable WHERE id_item IN (1,2,3,4,5);
It works! But my issue is that I don't know how to make an array in PHP to return (1,2,3,4,5) as this kind of array from my SELECT up there, because those 2 other conditions may vary and I have more "status = 0" in my db that can't be killed together. How am I suppose to do so? Please, I appreciate any help.

Answer 1

Unless there is more going on than what is shown, you should never have to select just to determine what to delete. Just form the DELETE query WHERE condition as you would in the SELECT:
DELETE FROM mytable WHERE status = '0' AND cond1 = '1' AND cond2 = '1'
But to answer how to get the IDs:
$result = mysqli_query($link, "SELECT id_item FROM mytable WHERE status = '0' AND cond1 = '1' AND cond2 = '1'");
while($row = mysqli_fetch_assoc($result)) {
$ids[] = $row['id_item'];
}
$ids = implode(',', $ids);
Move to PDO or MySQLi now.

Answer 2

First of all you shouldn't be using mysql_query anymore as the function is deprecated - see php.net
If this is a legacy application and you MUST use mysql_query you'll need to loop through the resource that's returned by mysql_query, which should look something like this
$result = mysql_query("SELECT id_item FROM mytable WHERE status = '0' AND cond1 = '1' AND cond2 = '1'");
$idArray = array();
while ($row = mysql_fetch_assoc($result)) {
$idArray[] = $row['id_item'];
}
if(count($idArray) > 0) {
mysql_query("DELETE FROM mytable WHERE id_item IN (" . implode(',' $idArray) . ")");
}

Answer 3

As said before, probably you don't even need a select. But you can do a select, grouping all ids together, and then put it in the delete IN.
$result = mysql_query("SELECT GROUP_CONCAT(DISTINCT id_item) AS ids FROM mytable WHERE status = '0' AND cond1 = '1' AND cond2 = '1'");
$ids = mysql_result( $result , 0, 'ids') ; // 1,2,3,4,5
if ($ids != ""){
mysql_query("DELETE FROM mytable WHERE id_item IN (" . $ids . ")");
}
GROUP_CONCAT