A reminder about triggering errors not in the USER level

July 21st, 2007 by Aaron

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I had a function in some of my code that I wanted to trigger a notice error on certain occasions. Unfortunately, it kept halting my script with a Warning instead. Unfortunately, the error handler at that particular block of code was not properly capturing the error string. It runs out that I was triggering an E_NOTICE instead of an E_USER_NOTICE error… (if I would have reviewed the trigger_error manual page, I wouldn’t have made this mistake… silly, lazy developer). Just to make sure that I fully understood this issue and hopefully wouldn’t make the same mistake again, I made a quick proof of concept:

From the comments on the manual page, I was able to grab a pre-made function that I stripped down. It prints out the error type as well as the error string. My test script also generates an error.

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<?php
function my_error_handler($errno, $errstr, $errfile, $errline){
    switch($errno){
        case E_ERROR:                  print "Error";                  break;
        case E_WARNING:              print "Warning";                break;
        case E_PARSE:                  print "Parse Error";            break;
        case E_NOTICE:                print "Notice";                 break;
        case E_CORE_ERROR:         print "Core Error";             break;
        case E_CORE_WARNING:     print "Core Warning";           break;
        case E_COMPILE_ERROR:    print "Compile Error";          break;
        case E_COMPILE_WARNING:print "Compile Warning";        break;
        case E_USER_ERROR:         print "User Error";             break;
        case E_USER_WARNING:     print "User Warning";           break;
        case E_USER_NOTICE:        print "User Notice";            break;
        case E_STRICT:                print "Strict Notice";          break;
        case E_RECOVERABLE_ERROR:print "Recoverable Error";      break;
        default:                             print "Unknown error ($errno)"; break;
    }
 
    print '<br />string: ' . $errstr;
}
 
set_error_handler('my_error_handler');
?>

Now, when I do the following:

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trigger_error('test error', E_USER_NOTICE);

Our output is predictable:
User Notice
string: test error

However, I was forgetting to put the USER in that error:

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trigger_error('test error', E_NOTICE);

And my error:

Warning
string: Invalid error type specified

So just a reminder, you can only trigger errors in the USER class.

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Tags: PHP

This entry was posted on Saturday, July 21st, 2007 at 1:55 pm and is filed under PHP. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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