Throw new exception doesn't stop the code

Question

I want to stop code execution (all application code). Actually I manage this code:

try
    {
        $connection = mysqli_connect(   $this->_host,
            $this->_username,
            $this->_dbPass,
            $this->_dbName  );

        if(mysqli_connect_errno())
        {
            throw new Exception("problem in connection.");
        }
    }
    catch(Exception $ex)
    {
        header($_SERVER['SERVER_PROTOCOL'] . ' 500 Internal Server Error', true, 500);
        echo json_encode(array("success" => false, "message" => $ex->getMessage()));
        return;   //<- application don't end
        //exit(); //<- application end
     }

Now if I call another method after the above code block that prints "hello world" with the return statement I get the echo, but if I use exit() I don't see any echo. So my question is: throw a new exception don't stop the application instance? I must use exit() for stop it after the exception instead of return?

Or die(); You are just setting the header but you must specify that your code should stop. — ka_lin
– ka_lin, Commented Feb 18, 2016 at 19:52
Thinking outloud here: exit( json_encode(array("success" => false, "message" => $ex->getMessage())); ); — Funk Forty Niner
– Funk Forty Niner, Commented Feb 18, 2016 at 19:53
@KA_lin haha I'm not english so it's difficult for me understand some humor :P — Sevengames Xoom
– Sevengames Xoom, Commented Feb 18, 2016 at 19:56
@SevengamesXoom: Additionally, you're making entirely incorrect use of exceptions here. If you want to perform the logic that's in the catch block in the event of a SQL connection error, just put that logic inside of your if block. There's no need for an exception here at all. As a general rule, never use exceptions for logic flow. — David
– David, Commented Feb 18, 2016 at 19:59
PHP has a lot of aliases for common functions, mostly to assist people coming from other languages. — Devon Bessemer
– Devon Bessemer, Commented Feb 18, 2016 at 20:10

Devon Bessemer · Accepted Answer · 2016-02-18 20:20:50Z

4

There has been quite a discussion in the comments, but to answer the question at hand, a return does stop execution of the script in the global scope.

http://sandbox.onlinephpfunctions.com/code/59a49286b1cbb62e92fd95134593c2da5ef94468

Example:

<?php

try {
    throw new Exception('Hello');
}
catch (Exception $e) {
    return;
}
echo "hello world"; // Not reached

?>

An exception will stop execution if it is uncaught. Otherwise, if the exception is caught, the same rules apply. In the global scope, return will exit the application, inside a function or method, a return will only exit the function.

exit() or die() will both exit the application no matter what scope they are called in.

answered Feb 18, 2016 at 20:20

Devon Bessemer

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1 Comment

Roman Over a year ago

i removed my own answer because this one is better.

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