<?php
public function getAll($sort) {
if($sort == NULL){
$sort = 'name';
}
echo $sort;
$sql = 'SELECT name, second_name, group_number, summary
FROM students ORDER BY :x';
$stmt = $this->dbh->prepare($sql);
$stmt->bindValue(':x', $sort);
$stmt->execute();
return $stmt->fetchAll(\PDO::FETCH_CLASS, 'app\models\Students');
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