Typo3: creating sideblock using PHP code - typo3

I have a piece of PHP code which I would like to integrate into Typo3 as a sideblock for a custom extension I have written.
Can someone tell me how to integrate PHP code into Typo3 as a sideblock or alternatively point me towards some sample code I can look at. I don't want to use typoscript or anything like that, just plain PHP code but so far I have been unable to find a method of doing so.
Any tips would me much appreciated.
Greetings/Thanks
R

I think you need use typo3 "userfunc". The below link may help you:
http://www.typo3wizard.com/en/snippets/common-problems-and-solutions/simple-userfunc.html

You might also consider the tscobj extension (http://typo3.org/extensions/repository/view/tscobj), which allows you to include an object like the one created by typo3wizards userfunc-code provided by Sankar V, as a content element in the editing environment of TYPO3. Remember to use "lib." as top-level identifier instead of "temp.", as is done in the snippet for typo3wizard.

Create a small extensions with the TYPO3 Extension kickstarter and insert it as a content element on the "sideblock part" of you website.

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require_once(t3lib_extMgm::extPath('rtehtmlarea').'pi2/class.tx_rtehtmlarea_pi2.php');
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I did lots of researches trying to use the rtehtmlarea in the FE, but failed. Then, I realized I could use any RTE, as they are nothing but js+css. All I need is to render the contents with RTE.FE, like how the BE does, and save the result into the database, which is all I want. I have already done this in many sites, using standalone tinymce, and it works great. So, I think maybe you could try this solution.
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best regards
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The feature is called Inline Relational Record Editing, short IRRE. The TCA-type is "inline".

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My question is how can I add/call extension manually any place I want. For example among text.
What i mean is like Joomlas Mambots. Call the extension inside {myextentionName} among text for example.
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