Implicit Evaluation with PHP Archives: Tutorial
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20 November 2006
Dynamic Image Generation in PHP
Through use of the GD libraries, it’s long been possible to write images in code with PHP. They’re unlikely to be photographic quality, but for captcha’s, counters, charts, etc, it’s unlikely that it needs to be. But this particular feature seems to be generally overlooked. PHP: Dynamic Image Generation is a nice tutorial for using […]
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24 October 2006
Session Management in PHP
Session management is one of the features that sets PHP apart from other languages which happen to be used on the web. It is easy enough to understand how to use $_SESSION, but many programmers seem to learn how to use it and nothing more.
$_SESSION serves a single, useful purpose. It makes variables available across […]
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2 October 2006
PHP and Perl Comparison
Today’s post is more practical than usual. A few weeks ago, I discovered a functional comparison between PHP and Perl authored by Professor Alva Couch of Tufts University. It struck me as a very useful resource, so I updated the PHP column to PHP5 (it was PHP3) and added all the function documentation I could […]
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27 September 2006
Tail Recursion in PHP
There are two types of recursion in the world: tail recursive and non-tail recursive. Non-tail recursive is the more obvious of the two and is used frequently. For instance, when dealing with any kind of hierarchical data (that which is expressed in a tree data structure) a recursive call is likely used to construct the […]
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14 September 2006
Objects and Arrays in PHP
In PHP, Objects and Arrays are very similar. Objects can easily be cast as an array with get_object_vars, and a simple foreach loop can easily construct an stdObject from an array. Their similarities mean there is little you can do with one that you cannot do with the other. Some of the differences (at first […]
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1 May 2006
Accessing Multi-dimensional Array
This weekend, I got an email from a reader wondering how to access non-constant indices of a multidimensional array.
Given an HTML field like <input name=”users[username][email]” type=”text” />
He needed to know how to access it. After trying multiple things, the solution he found was:
$property = “[username][email]”;
$field = $_POST[”users”];
$result = eval (”$field$property;”);
The more obvious $result = […]
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8 March 2006
PHP Help: get_defined_vars - PHP Manual
This is the kind of function that makes me love PHP.
Read more at www.phpfreaks.com/phpma…