What are some potential pitfalls of manually incrementing IDs in PHP when inserting data into a database?

Manually incrementing IDs in PHP when inserting data into a database can lead to potential issues such as duplicate IDs, gaps in the sequence, and concurrency problems in a multi-user environment. To solve this, it is recommended to use auto-incrementing primary keys in the database to ensure unique and sequential IDs are generated automatically. 

// Example of inserting data into a table with an auto-incrementing primary key
$sql = "INSERT INTO users (name, email) VALUES ('John Doe', 'john.doe@example.com')";
if ($conn->query($sql) === TRUE) {
    $last_id = $conn->insert_id;
    echo "New record created successfully. ID: " . $last_id;
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

Keywords

SQL injection auto-increment primary key prepared statements data integrity

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