Question

$ids = array(1,2,3);
$in = implode(',',$ids);

$query = "SELECT * FROM user where user_id IN ($in) ";

Query works no problem. But when $ids is empty array $ids = array();

I got sql query error rightly so because SELECT * FROM user where user_id IN () is not a valid query .

How can I avoid such situation without checking for empty array i.e making query run no matter what ?

Answer 1

Best way to manage this is:

$in = implode("','",$ids); // generate like 1','2
$query = "SELECT * FROM user where user_id IN ('$in') "; //  if has  1','2 surrond it with quote make it IN('1','2') and if empty than IN('')

This saves you from if/else structure and everything else