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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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If you are playing around with PHP then you may want to look at the php function strip_tags(). This will remove HTML tags from the string, but you can add an exception list of allowable tags. Comments are always stripped, which is probably what you are looking for. This way you can restrict the number of allowable HTML tags that your submitters can use.