How to show php content in textarea?

how can i show a PHP variable in a textarea?

 

Create a file and add this code:

$variable_name = "Some text ...";
<form method="post" action="" style="margin:0px">
<textarea name="" rows="4" cols="44"><?php echo $variable_name;?></textarea>
</form>

Code (markup):

"Some text ..." will appear in the textarea.

 

I am also looking for that type of script . this script will help me lot in completion of my future project. thanks a lot