Are there any potential drawbacks or limitations to using AUTO_INCREMENT in MySQL for ID generation?

One potential drawback of using AUTO_INCREMENT in MySQL for ID generation is that it can lead to gaps in the sequence of IDs if rows are deleted from the table. This can result in non-consecutive IDs and potentially cause issues with data integrity or referencing. One way to address this issue is to use a custom ID generation method in PHP that ensures unique and consecutive IDs without relying on the AUTO_INCREMENT feature of MySQL.

// Custom function to generate unique and consecutive IDs
function generateCustomID($tableName, $columnName){
    $query = "SELECT MAX($columnName) as max_id FROM $tableName";
    $result = mysqli_query($connection, $query);
    $row = mysqli_fetch_assoc($result);
    
    $maxID = $row['max_id'];
    $newID = $maxID + 1;
    
    return $newID;
}

// Example of using the custom ID generation function
$newID = generateCustomID("users", "user_id");
echo "Generated ID: " . $newID;