<?php
$link = mysql_connect('server','user','pass');
mysql_select_db('db_name',$link);
if(count($_POST)){
	mysql_query('insert into table_name (text) values ("'.$_POST['text'].'")');
}
$data = mysql_query('select * from table_name');
while($text = mysql_fetch_assoc($data)){
	$tag.= $text['text'].'</br>'
}
echo $tag;
?>