Professional
LAMP
Linux,
Apache, MySQL, and PHP5 Web Development
By
Jason Gerner, Elizabeth Naramore, Morgan L.
Owens, Matt Warden
What’s
New in PHP5?
So what’s the big deal about PHP5? If you’re
experienced with PHP4, you probably know about object-oriented programming and
the way this was handled with PHP4. If you’re unfamiliar with PHP, but you’re
familiar with other programming languages, you’ll probably find PHP5’s
implementation of object-oriented principles familiar. Luckily, things have
become a lot easier with the release of PHP5. However, there are other
improvements and changes, such as more configuration options in php.ini and a
host of new array-related and other functions, besides just “better object oriented
programming” handling. This chapter outlines these changes for you.
Object-Oriented Changes
The changes that follow relate to the OOP
model and associated features and related topics. The majority of these changes
are covered in greater detail in Chapter 2, but are also briefly outlined here
for your quick reference.
Passing Objects
One big impact of OOP changes in PHP5 is the
way that variables are passed as parameters to functions. In PHP4, by default,
variables were passed by value instead of by reference, unless denoted otherwise
with the syntax &$varname. In PHP5, the default is to assign a value by
reference.
Exceptions
In a nutshell, exceptions are the procedures
that happen when something goes wrong. Instead of your program completely
halting when it reaches an unexpected error, you can now exert a little more
control over what the program should do when it reaches said error. You are
probably familiar with the set error handler() function available in PHP4. If
you aren’t, the purpose of this function is to define a user function for error
handling. However, it had many limitations in its implementation.
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