PHP2008-11-23
File Handling in PHP
Let's begin with the basic file-accessing functions. Originally, those functions only worked on normal files, so their names begin with "f," but PHP extends this to almost everythi
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xml2008-11-23
What is the structure of an XML?
The first line is the XML declaration; it specifies the XML version and the XML file encoding. Notice that the line starts with
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Handling BLOB in PHP and MySQL
BLOB stands for Binary Large OBject and refers to binary data, such as JPEG images stored in the database.
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MySQL Strengths and Weaknesses
This article contains some information about the strengths and weaknesses of MySQL.
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Using Sessions in PHP
A PHP session allows an application to store information for the current "session," which can be defined as one user being logged in to your application. A session is identified by
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Using Cookies in PHP
One simple way to maintain data between the different pages in a web application is with cookies. Cookies are sent by PHP through the web server with the setcookie() function and a
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PHP2008-11-23
Using PEAR::Crypt_HMAC in PHP
The Crypt_HMAC class implements the algorithm as described in RFC 2104 and can be installed with pear install crypt_hmac.
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Using HMAC Verification in PHP
If you need to prevent bad guys from tampering with variables passed in the URL (such as for a redirect as shown previously, or for links that pass special parameters to the linked
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Input Validation in PHP
One essential technique to protect your web site from users is input validation, which is an impressive term that doesn't mean much at all. The term simply means that you need to c
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What is SQL Injection
SQL Injection is a method in which an attacker inserts malicious code into queries that run on your database.
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__autoload() METHOD in PHP
When writing object-oriented code, it is often customary to put each class in its own source file. The advantage of this is that it's much easier to find where a class is placed, a
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__toString() METHOD in PHP
Unlike most other data types, printing the object's id will usually not be interesting to you. Also, objects often refer to data that should have print semantics—for example, it
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