How To Throw A Warning in PHP (and Catch It)

Here is how to throw a warning in PHP:

<?php

// trigger a user warning with your $message
trigger_error($message, E_USER_WARNING);

You can throw other errors, like

• E_USER_ERROR: Fatal Error
• E_USER_WARNING: Warning
• E_USER_NOTICE: Notice (default)

You can catch errors and warnings since PHP7. Just catch a Throwable instead of an Exception, like so:

try {
    some_function();
} catch (Throwable $e) {
    // catch the notice, warning or fatal error
}

The difference between a notice and a warning or fatal error is that a notice won’t stop the execution of the script, but a warning or fatal error will.

Don’t forget to set the error_reporting level to E_ALL, otherwise you won’t see the errors, like so:

error_reporting(E_ALL);