PHP Manual -  .

Add a text-size switcher to your Web site with PHP and CSS - TechRepublic - - This tutorial will show you how to add such a text size switcher to your Web pages using PHP and CSS, thereby immediately making your Web site more accessible and scoring you useful brownie points from everyone over the age of 50.

Add mapping functionality to Web sites with Image_GIS in PHP [Tech Republic] - - Image_GIS is a PEAR package for PHP that allows you to add digital maps to Web sites using free downloadable GIS files. Learn how to use the Image_GIS package to add mapping functionality to a Web site.

Authenticate and Track Users with PHP (Webmonkey) - - Learn how authentication, cookies, and sessions can add security and a personal touch to your site.

Blobbing Data With PHP and MySQL (Devarticles) - - Showing how to store and retrieve binary data in a MySQL database by using PHP.

Build your own Web Service with PHP and XML-RPC - - Harry takes us one step further into the world of Web Services. Here he explains how to build your own Web Service - a news feed - using PHP and XML-RPC.

Building a search application using PHP and the Google Search API - - This article will teach you how to build a search application using the Google search API and PHP. Presents a demo, as well as downloadable source code.

Building a weblog with PHP and MySQL - - A tutorial on building a simple yet functional weblog system using PHP and MySQL.

Building Modular XHTML Web Pages using PHP - - A series of labs describing the process of building modular, structured and valid XHTML Web pages using the PHP server-side scripting language.

Classes and PHP (PHPBuilder) - - A description in plain English of what classes are, and how they can make your project easier to complete and extend.

Code Injection Vulnerabilities Explained - - Code Injection is a term used when code is injected straight into a program/script from an outside source for execution at some point in time.

Comprehensible PHP Code (PHPBuilder) - - A good programmer makes her code look so simple and comprehensible that any other programmer can understand it and appreciate it.

Configuration Manipulation With PHP Config (Dev Shed) - - This article introduces a toolkit designed specifically for manipulating configuration files, thereby reducing the number of lines of code needed to read and modify application variables. This toolkit is written in PHP and implemented as a class, suitable for use in any PHP-based application and accessible via standard OO techniques.

Control transformations using XSLT parameters (TechRepublic) - - Phillip Perkins outlines the advantages of using XSLT, which includes the fact that you aren't restricting your data to one particular layout.

Create an audio stitching tool in PHP (TechRepublic) - - One way to provide visually impaired users with the ability to use OCR-defeating passcodes is to stitch WAV files together. Phillip Perkins shows you how to deconstruct a group of WAV files and reconstruct one large WAV file by compiling the group.

Database Abstraction With PHP (Dev Shed) - - Take a look at the PEAR database abstraction layer, one of the coolest PHP widgets out there.

Database Enabled Websites - - A tutorial on using PHP3 and MySQL to develop database enabled applications for websites.

Devshed - Searching with PHP and ht://Dig - - Adds search capabilities to site using the popular open source tools PHP3 and ht://Dig.

Encryption and Decryption using PHP and GnuPG (Zend) - - The purpose of this article is to show you how to encrypt and decrypt information with GnuPG using PHP.

Error Handling: Stepping beyond True/False Results (Zend Technologies) - - This article will give you the capabilities to handle errors in an elegant manner without diverging too much from your lazy ways. We will look at how to handle PHP script errors, as well as passing around your own errors with the PEAR module: PEAR_Error.

The Fast Track Tutorials - - Tutorials covering many aspects of PHP, including MySQL and the file system.

File And Directory Manipulation, Part 1 (Dev Shed) - - PHP comes with a full-featured file and directory manipulation API that allows you (among other things) to view and modify file attributes, read and list directory contents, alter file permissions, retrieve file contents into a variety of native data structures, and search for files based on specific patterns. This file manipulation API is both powerful and flexible - two characteristics that will endear it to any developer who's ever had to work with file manipulation commands.

File And Directory Manipulation, Part 2 (Dev Shed) - - This second segment of the tutorial on the PHP filesystem API takes you into deeper waters, showing you how to copy, delete and rename files; scan directories; work with uploaded files over HTTP; perform pattern matches on file names; and read and write to processes instead of files.

Getting Intimate With PHP's Mail() Function - - PHP's Mail() function is a great way to send mail using a simple and standard interface that hides the complexity and quirks of various system programs that are responsible for sending mail. This tutorial will introduce you to the basics of sending mail from PHP scripts.

GIS Mapping in PHP - - A series of tutorials on using PHP to access GIS mapping information. The tutorials start with the basics, build on them, and provide many examples for more complex functions.

How To Compile PHP 4 and Apache 2 from Source On Linux - - Provides detailed, step-by-step information on compiling PHP as an Apache 2.0 shared module on a Linux system.

How to use PHP for server side includes - - Covers the basics on how to do virtual includes in a PHP file.

Implement Bayesian Inference Using PHP - - Conditional probability -- the probability of observing one event as a result of having observed another event -- is a potentially important factor in designing intelligent Web applications. Paul Meagher introduces Bayesian inference by discussing the basic mathematical concepts involved and demonstrating how to implement the underlying conditional probability calculations using PHP.

Installing Apache, MySQL, and PHP on Linux - - This tutorial is designed to guide through the initial steps of setting up Apache, MySQL, and PHP on Linux.

Installing Apache, PHP, and MySQL - - An indepth article that offers a step by step guide on setting up a home server for website development and testing.

An Introduction to Classes (Zend) - - The tutorial guides you through the construction of a simple, security-related class that performs some basic security functions for a web site: checking user logons.

Introduction to PHP Image Functions - - An excellent overview of PHP image functions, including source code and interactive online examples.

Jason Bradley Online - - PHP and GIMP tutorials.

Magic Quotes and Add Slashes in PHP - - PHP Tutorial on magic quotes, why they are bad, and how to get around them.

Open Source Licensing For PHP Scripts - - Open Source licensing for PHP scripts. Open Source means that your software is entirely free for use, to anyone, and any user may modify the software to fit his own needs. To launch an open source application, you have to apply the GNU GPL License.

PEAR MDB Database Abstraction Layer (International PHP Magazine) - - This article gives a good introduction to the database abstraction package PEAR MDB. The focus is on explaining the more advanced features of MDB like data type abstraction and the XML based schema management that go beyond what other similar packages offer. A basic level of understanding of PHP and SQL is recommended.

PHP and Regular Expressions 101 (WebReference) - - This tutorial steps through the POSIX-compliant regular expression functions in PHP in a straightforward manner.

PHP Common Mistakes and their Solutions - - About the various security concerns and mistakes people make when developing, and their solutions.

PHP Feedback Form with Source Code - - Tutorial for feedback, bug report, contact PHP forms includes all copy and paste code.

PHP For Designers - - PHP introduction for web designers by Matt Mullenweg.

PHP MySQL Interactive Website Design - - The lessons provided in this PHP/MySQL tutorial are short and simple. You'll learn to create and manipulate a simple database of names and birthdates.

PHP Sessions Introduction [PHP Freaks] - - PHP has a great set of functions that can achieve the same results of Cookies and more without storing information on the user's computer: PHP sessions. This is nearly 99% flawless in operation and it is virtually invisible to the user.

PHP Tutorial (BobFrank.org) - - A basic PHP tutorial for beginners. It includes printing, variables, constants, math, strings, files, functions, arrays, and several other key points of PHP.

PHP Tutorial (by Martin Geisler) - - This tutorial is aimed at users who have no previous experience with programming in PHP or any other programming language.

PHP Tutorial (Tizag) - - A PHP tutorial that covers all the basics of PHP. It is geared towards web developers with little or no PHP experience.

PHP Virtual Guide - - Video tutorials covering PHP from the basics to advanced techniques.

PHP/MySQL Tutorial (Webmonkey) - - Three-part tutorial covers installation, basic scripts, forms, and advanced topics.

Pitfalls of Transactions with PHP (ONLamp) - - Database transactions are important for data reliability and consistency. Used properly, they can prevent many types of errors. Used improperly, they can cause many other kinds of errors. Kimberlee Jensen demonstrates using transactions with PHP well.

Programming PHP - - A wikibook about programming in PHP. Also provides external links for more information.

Saving Resources with phpCache (Website Publisher) - - Tutorial explains how to implement the phpCache script and use it to keep your database server load low.

Search Engine-Friendly URLs (Website Publisher) - - Article describes three ways to make your URLs search engine friendly using PHP.

Serving XHTML with the correct mime type using PHP - - Describes how to send XHTML with the correct mime type safely using PHP. Includes the ability to "fall back" to HTML if the viewing web-browser does not support XHTML.

Simple Classes Introduction - - By the end of this tutorial, you'll have a better understanding of what classes are and what they are good for. Classes can be very powerful when used right and can save you a lot of work (and typing) in the long run.

Simple Linear Regression With PHP - - In contrast with other open source languages like Perl and Python, PHP lacks a robust community effort to develop a math library. This article provides an example of a PHP math library called SimpleLinearRegression that demonstrates a general approach that can be used to develop PHP math libraries.

SimplePHP - - Windows Installation Guide for Apache + PHP + MySQL + PHPMyAdmin.

SQL Injection [Chris Shiflett: Security Corner] - - Most Web applications interact with a database, and the data stored therein frequently originates from users. Thus, when creating an SQL statement, a developer may use client data in its construction. This article explains SQL injection by looking at a few example attacks and then introducing some simple and effective methods for prevention. By applying these best practices, you can practically eliminate SQL injection from your list of security concerns.

Static Free Energy (Zend) - - This tutorial will show you how to produce static html pages using PHP. This is important if you want the benefits of using PHP to build sections of a site where the content of the pages doesn't change very often.

Taking PHP the OO way (International PHP Magazine) - - The future for applying Object Oriented Programming in PHP looks bright, when we look at the new OO features that PHP 5/Zend Engine 2 brings us. With the right tools, all you need is the knowledge. This article will try to explain what objects really are and how they can be recognized, and it will familiarize you with the "3 Pillars" that form the foundation of Object Oriented Programming: Encapsulation, Inheritance and Polymorphism.

Template Example with PHP Includes - - Show how to use 'php includes' inside a template.

Ten Security Checks for PHP (ONLamp) - - Though it's easy to create sites in PHP, it's not immune to sloppy coding. Clancy Malcolm explains how to recognize and fix potential security holes.

Three-Tier Development with PHP 5 (ONLamp.com) - - Luis Yordano Cruz demonstrates three-tier PHP application design with PEAR::DB_DataObject, Smarty, and PHP 5. The article assumes that you have some familiarity with HTML, Smarty, PEAR::DB_DataObject, MySQL, and PHP 5.

Time-2-Design - - Offers PHP tutorials (commented scripts). Also some C++, flash and photoshop tutorials.

Try PHP - - Learn how to use, install, communicate and setup PHP and MYSQL.

Use BB Code in Your PHP Application (SitePoint) - - BB code is a simple set of instructions that provide rules as to how a piece of text should be formatted. In this hands-on tutorial, Stoyan explains the basics that every developer should know about the use of BB code in PHP applications.

Using Cookies in PHP (Website Publisher) - - Learn how to set and read cookies using the PHP scripting language.

Using PHP 5's SimpleXML - - This tutorial explains the usage of the Simple XML extension new to PHP 5. It provides examples of reading and querying XML data.