What are the considerations for handling deleted user accounts in a PHP referral system?

When handling deleted user accounts in a PHP referral system, it is important to update the referral structure to remove any references to the deleted user. This can be done by checking for the existence of the user before processing any referrals or by implementing a cleanup process to remove any invalid references. 

// Check if the referred user exists before processing the referral
if($referredUserId = getUserById($referral->referred_user_id)){
    // Process the referral
} else {
    // Handle the case where the referred user does not exist (e.g. remove the referral)
}

// Function to get user by ID
function getUserById($userId){
    // Query the database to check if the user exists
}

Keywords

MySQL soft delete foreign key constraints PHP sessions user authentication

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