PHP → Tips and Tutorials → Security

How to restrict visitor access to your web site

Learn by example the proper ways to apply restrictions on your web site.

• Platforms
  • Linux,
  • Windows,
  • FreeBSD,
  • Mac OSX,
  • Sun Solaris
• Licenses
  • Freeware

Validate credit card numbers

An easy example on how to validate credit card numbers using a small and handy PHP script.

• Platforms
  • Linux,
  • Windows,
  • FreeBSD,
  • Mac OSX
• Licenses
  • Freeware

Math Captcha image validation

With all the Captcha decoders these days, its impossible to build a solid Captcha image validator with a string. The solution? Have a captcha that asks simple math addition questions! Decoders are not very good at breaking these. This tutorial ...

• Platforms
  • Linux,
  • FreeBSD
• Licenses
  • GPL

Simple IP Address Format Checker

There are more extensive ways to do an IP address format check, but this is a good cursory check. Simply call it passing an IP address as a string and it will return true if it''s valid, false if it isn''t.

• Platforms
  • Linux,
  • Windows,
  • FreeBSD,
  • Mac OSX,
  • Sun Solaris
• Licenses
  • Freeware

Hotlink Protection with PHP

Hotlinking is when another website links directly to one or more of your images or multimedia files and includes it on their web page. Not only is this theft of your intellectual property, but further more, you are paying for the bandwidth used by th...

• Platforms
  • Linux,
  • Windows,
  • FreeBSD,
  • Mac OSX,
  • Sun Solaris
• Licenses
  • Freeware

MD5 Encryption in PHP

Md5 is a very easy way to encrypt any string data. Following example take and encrypts a string. Remember that you could not dencrypt any data after encryption. .

• Platforms
  • Linux
• Licenses
  • Freeware

Using mod_rewrite To Your Advantage

Learn how to use mod_rewrite to your advantage to take some overhead off your PHP script and validate Query Strings faster and more securely than any hard coded PHP script.

• Platforms
  • Linux,
  • Windows,
  • FreeBSD
• Licenses
  • Other Free / Open Source License

Creating a CAPTCHA with PHP

In this tutorial, you will learn how to creat a CAPTCHA utilizing the graphics capabilities of PHP.

• Platforms
  • Linux,
  • Windows,
  • FreeBSD,
  • Mac OSX,
  • Sun Solaris
• Licenses
  • Other Free / Open Source License

Silentum PasswordGen

Silentum PasswordGen is an excellent password generator tool if you need passwords for email clients, message boards, IM programs, or any other protected pages. It has various options, including choosing whether to use lowercase/uppercase letters, nu...

• Platforms
  • Linux,
  • Windows,
  • FreeBSD,
  • Mac OSX,
  • Sun Solaris
• Licenses
  • Freeware

Build up a function to secure a text box

A detailed php tutorial that shows how to create a useful function to secure a web site from attack attempts passing through text boxes.

• Platforms
  • Linux,
  • Windows
• Licenses
  • Freeware

Page:

• Previous
• 1
• 2
• 3
• 4
• Next