Variables and References Article
A week ago PHP 4.4.0rc1 was released - this release addresses major problems with references in PHP. But not many people are fully aware of how variables and references actually work in PHP. This is where my latest article in PHP Architect comes into play. It explains in details how assigning variables, passing variables to functions and returning variables from functions work - both by-value and by-reference.
Comments
Thanx for the article, it gives a deep insight into PHP internals.
However, there's one issue left unspoken, that is PHP5 objects internal model. It's obvious they're not just variables...
How are they implemented actually?
Consider the following lines in PHP5:
$a = new Foo(); $b = $a;
Is it equivalent internally in PHP5 to this:
$a = new Foo(); $b =& $a;
If not what the difference? Is it actually "healthy" to use & with objects in PHP5? Is there speed overhead?
I'm asking all these questions because we're using PHP5 with applications which were written solely for PHP4 yet using OOP. These applications use & almost everywhere and i wonder how PHP5 treats it internally....
Life Line
Merge branch 'xdebug_3_5'
Merged pull request #1111
Disable 'declaration after statement' warning in zend_smart_string.h,…
Specify bicycle parkings covers
Specify street/place names to addresses
Survey housenumbers
Specify whether crosswalks have tactile paving
Specify whether roads have sidewalks
Determine whether ATM allows depositing cash
Survey if places still exist
Survey if places still exist
Specify access to places
Specify whether steps have handrails
Specify width of opening
Specify parking types
Specify whether public transport stops have tactile paving
Survey opening hours
Specify step counts
Survey tactile paving on steps
Specify whether steps have a ramp
Specify which way leads up for steps
Specify path surfaces
Specify whether there are cycleways
Created an entrance
Created a bicycle_parking
Shortlink
This article has a short URL available: https://drck.me/vara-41v