ZEND PHP 5 Certification STUDY GUIDE

PHP Basics ” 35
As you can see, the function name of the old error handler (if any) is returned by the
call to set_error_handler()—this allows you to stack several error handlers on top of
each other, thus making it possible to have different functions handle different kinds
of errors.
It’s important to keep in mind that your error handler will completely bypass PHP’s
error mechanism—meaning that you will be responsible for handling all errors, and
stopping the script’s execution if necessary.
i
As of PHP 5, set _error_handler() supports a second parameter that allows you to specify
the types of errors that a particular handler is responsible for trapping. This parameter
takes the same constant values as the error_reporting() function.
Summary
This chapter covered many of the essentials of any PHP application. While simple,
they are the building block of any application and, therefore, you should be completely
familiar with them, their capabilities and any special requirements that they
have.
There are some fundamental elements that we have only glossed over here: arrays,
strings, functions and objects. These are complex enough to warrant their own
section of the book and are, therefore, covered in the next four chapters.
Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)