Searching MySQL for part of an array - mysql

Question

Im trying to take an array of titles from the column 'list' and then get details for every title on said list.
//Get list
$r=$link->prepare('SELECT list FROM lists WHERE user=? LIMIT 1');
$r->bindValue(1,$user,PDO::PARAM_STR);
$r->execute();
$list=$r->fetchAll(PDO::FETCH_ASSOC);
//See how many titles the list has
$list_length=count($list);
//Get details for every title
for($i=0;$i<$list_length;$i++)
{
$r2=$link->prepare('SELECT * FROM details WHERE title=?');
$r2->bindValue(1,$list[$i],PDO::PARAM_STR);
$r2->execute();
$details=$r2->fetchAll(PDO::FETCH_ASSOC);
}
return json_encode($details);
As it is I get echoed just [].
I also get Notice: Array to string conversion in $r2->bindValue(1,$list[$i],PDO::PARAM_STR);

Answer 1

You have to learn to read your code, instead of asking others to do it for you.
SELECT list FROM lists WHERE user=? LIMIT 1
Look at this query. Does it looks like one that can return an array of rows?
Learn SQL. And JOINS particularly
And here goes the code
$sql = 'SELECT details.* FROM lists JOIN details on title=list WHERE user=?';
$stm = $link->prepare($sql);
$stm->execute([$user]);
json_encode($stm->fetchAll(PDO::FETCH_ASSOC));
Just FOUR lines