Validate_String  

The author wrote this function to intercept strings that would not make good user names due to the presence of invalid url characters. If the string contains no invalid characters, the function returns true, if it does, it either returns false or a formatted string containing all the invalid characters.

Price: Free

   Dynamic Error Pages  

Dynamic PHP script which returns different error messages depending on the error received. The script will also send an e-mail to your e-mail address with the time, error received, requested page and the page they came from.

Price: Free

   Simple Errors  

Simple Errors is a simple error logger. It replaces the default Apache error handler with your own. Customizable output page to suit your own needs. Even logs and/or emails you when an error occurs! Can add new error codes easily, using the flat file database.

Hosting Requirements: Apache; PHP
Price: Free (GPL)

   Better Error Handling with Mail  

This script will alert the webmaster quickly if an error occurs on a PHP Web page by emailing the person details of the error. This is very useful for Web sites with part-time webmasters and large ones where not every page can be tested by the webmaster.

Hosting Requirements: PHP 4
Price: Free

   PHPSiteMon  

With PHP Site Mon you will be emailed if an error occures on your website, instead of having your site inaccessible for days.

Price: Free (GPL)

   LinkRot Script  

Script to track where a dead link came from as well as the webpage that it was trying to access.

Price: Free

   PHPMachine Error Handler  

This code snippet can be used to trap errors in your PHP scripts. The main function is GetErrorDescription, it takes five arguments, the error type, the error message, the file the error occurred in, the line number where the error occurred, and an array containing the variables initialized and available at the time of the error. Each of these parameters is provided by PHP whenever an error occurs. The function returns HTML content that can be displayed on the page, saved to a file, e-mailed to the webmaster, or anything else that you can think of!

Hosting Requirements: PHP
Price: Free

   errorBot  

Enables you to design and customise the error-documents your web server presents to a surfer.

Price: Free