News Feed
Jobs Feed
Sections




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

Anthony Ferrara:
The Anatomy Of Equals - Opcode Analysis
July 19, 2012 @ 10:11:48

Anthony Ferrara has a new post today getting into the details of how "equals" works in PHP at the opcode level. He focuses on the answer to a question he received:

I was asked an interesting question via email yesterday. The question is fairly simple. The answer, not so much... So, rather than reply in an email, I figured that I'd write a post about it instead. The question, simply stated, is: "When comparing a float to an integer using ==, where does the conversion happen?"

He starts with a super simple piece of test code that compares an integer (1) to a float (1.0) and walks through the process PHP takes to perform the comparison (with a double equals "=="). He talks about opcode handlers, the "fast equal function" and how it handles the casting from one type to another, C source highlights included.

0 comments voice your opinion now!
equals opcode source language cast variable


blog comments powered by Disqus

Similar Posts

NetTuts.com: Why 2013 is the Year of PHP

PHP.net: PHP 5.5.1 Released

Derick Rethans' Blog: Variable tracing with Xdebug

PHPClasses.org: The Secret PHP Optimization of version 5.4

PHPClasses.org: Lately in PHP, Episode 23 - Will it ever Matter if PHP Sucks?


Community Events











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


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

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework