News Feed
Jobs Feed

News Archive
feed this:

Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Sara Golemon's Blog:
How long is a piece of string?
June 19, 2006 @ 05:56:03

Sara Golemon, inspired by an IRC discussion has gathered together some of her thoughts on "using PHP's string interpolation without using an optimizer".

She explains how a simple string (an echo statement) is interpreted into a simple compilation structure. Her next step, though (placing a variable inside a string) yields something that seems more complex than it should be. A concatination example simplifies things down a bit, but, oddly enough, it gets even better when a comma is used instead of a period to concatinate. She also gives an example of a heredoc statement that doesn't conform to the interpolation standards you'd think.

Why does this happen? Because there are about a dozen ways that a variable can be hidden inside an interpolated string. Similarly, when looking for a heredoc end-token, the token can be an arbitrary length, containing any of the label characters, and may or may not sit on a line by itself. Put simply, it's too difficult to encompass in one regular expression.

She specifically mentions the APC caching system and its built-in optimizer to help with some of these issues. It pulls the interpolations back down to a size they should be and anticipating operations by pre-resolving things like constants and scalar expressions.

Of course, not everyone can install this pacakge, so she suggests an alternative:

You can still avoid 90% of the INIT_STRING/ADD_STRING dilema by simply using single quotes and concatenation (or commas when dealing with echo statements). It's a simple trick and one which shouldn't harm maintainability too much, but on a large, complicated script, you just might see an extra request or two per second.
0 comments voice your opinion now!
internals string concatination opcodes period comma heredoc apc internals string concatination opcodes period comma heredoc apc

Community Events

Don't see your event here?
Let us know!

install podcast code unittest symfony2 security overview application facebook package hhvm opinion series composer introduction hack component language release framework

All content copyright, 2014 :: - Powered by the Solar PHP Framework