Php prepare method where should I use While loop - php

Question

I am new to PHP prepare method, I need some help to use while loop in the following code.
Here is the query function
function query($query, $bindings, $conn) {
$stmt = $conn->prepare($query);
$stmt-> execute($bindings);
$result = $stmt->fetchAll();
return $result ? $result : false;
}
and the query
$home_team = query('SELECT home_team FROM premier_league
WHERE match_date >= :current_date
AND pre_selected = :pre_selected
ORDER BY match_date LIMIT 5',
array('current_date' => $current_date,
'pre_selected' =>$pre_selected),
$conn);
if (empty($home_team)){
echo "No Match Selected for Today.";
} else {
print_r($home_team);
}
How and where I use while loop for this query?

Answer 1

you don't need no while here
function query($query, $bindings, $conn) {
$stmt = $conn->prepare($query);
$stmt-> execute($bindings);
return $stmt->fetchAll();
}
$sql = 'SELECT home_team FROM premier_league WHERE match_date >= ?
AND pre_selected = ? ORDER BY match_date LIMIT 5';
$home_team = query($sql,array($current_date, $pre_selected), $conn);
foreach ($home_team as $row) {
echo $row['home_team']."<br>\n";
}

Answer 2

In else block
else {
print_r($home_team);
/* here
foreach ($home_team as $team) {
echo $team->home_team . '<br>';
}*/
}

Answer 3

PDOStatement implements Traversable so using fetchAll would be a overhead.
function query($query, $bindings, $conn) {
$stmt = $conn->prepare($query);
$stmt->execute($bindings);
$stmt->setFetchMode(PDO::FETCH_ASSOC);
return $stmt;
}
$home_team = query...;
foreach ($home_team as $row) {
echo $row['home_team']."<br>\n";
}

Answer 4

The idea of using a prepared query is to have the server parse the query once and create a query plan once. This is useful for queries that you execute repeatedly, only changing the parameter values.
Accordingly:
- the prepare should be done once.
- the execute should be done inside the loop.
If you are executing a query once in a while, then the prepare overhead is not worth it.