You can achieve that with a basic form:
index.php:
<?php
if ($_POST) // If form was submited...
{
$text = $_POST["mytextarea"]; // Get it into a variable
echo "<h1>$text</h1>"; // Print it!
}
?>
<form method="post">
<textarea name="mytextarea"></textarea>
<input type="submit" value="Go!" />
</form>
And this can be done whatever input element you want e.g: inputs type text, password, checkbox, radio or a select or even and fresh HTML5 input type.
Give your textarea a name and post it to a PHP script with a form. The data from the textarea will be available in the $_POST['textareaName'] variable.
HTML
<form action="page.php" method="post">
<textarea name="myTextarea"></textarea>
<input type="submit" value="go" />
</form>
PHP
<?php
echo $_POST['myTextarea'];
?>
You can Post the form and can access the variable of the form with $_POST['myObj'];
Looking at the $_POST and fetching the value from the post through object name.
Here, "myObj" is an example object name.
you need to submit the form to get the textarea value. Or you can use Jquery to get the textarea content
