freeCodeCamp/guide/english/php/errors/exceptions/index.md

title
Error Exceptions

Error Exceptions

Similar to other programming languages, you generally want to throw Exceptions when some sort of error occurs. Consider the following example of a withdraw() function in a theoretical BankAccount class where the balance goes below 0:

function withdraw($amount) {
    $newBalance = $this->balance - $amount;
    if ($newBalance < 0) {
        throw new Exception('Balance would go below zero');
    }
    return $newBalance;
}

In this case, if the value of $this->balance was 5 and $amount was 10, you wouldn't want to authorize the withdrawal. By throwing an Exception, you ensure that the withdrawal doesn't take place if there is not enough money in the account.

More Information

• PHP Manual: Exceptions