Custom Error Message Generation

Option: message_callback
Option: context_callback

In the default error class HTML_Progress2_Error there are two methods designed for use with generating error messages efficiently. To use them, you must set the options message_callback, and context_callback.

Option: message_callback

The default message handling callback (HTML_Progress2_Error::_getErrorMessage) get an array mapping error codes to error message templates, like so:

<?php
$messages = array(
HTML_PROGRESS2_ERROR_UNKNOWN =>
'unknown error',
HTML_PROGRESS2_ERROR_INVALID_INPUT =>
'invalid input, parameter #%paramnum% '
. '"%var%" was expecting '
. '"%expected%", instead got "%was%"'
);
?>

Basically, if a variable name is enclosed in percent signs (%), it will be replaced with the value passed in the associative array.

Option: context_callback

The default context handling callback (HTML_Progress2_Error::getBackTrace) gets an array of execution functions and discovers where the error was generated.

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Error Context Display	Home	Chapter 17. Events to observe

HTML_Progress2 : The Definitive Guide