What potential issues can arise when using PHP to manipulate dates in SQL queries?

One potential issue that can arise when using PHP to manipulate dates in SQL queries is the difference in date formats between PHP and SQL. To avoid this issue, it is recommended to use the `date()` function in PHP to format dates in a way that is compatible with SQL.

// Example of using the date() function to format dates for SQL queries
$date = date('Y-m-d H:i:s', strtotime('2022-01-01'));
$query = "SELECT * FROM table WHERE date_column = '$date'";
$result = mysqli_query($connection, $query);