Storing the last input text whilst using the POST method with PHP -

the idea:

i have been trying create one-way chat system based on predictions user, using pre-set automatic responses through server side.

the problem:

what have far works great, although problem have can't store last user inputted message locally chat flow in messages without using lots of _get's.

with current code:

if (isset($_post['test'])) {     $test = htmlentities($_post['test']);     echo "<span class='you'>".$name."</span>: ".$test;     if (preg_match('~\b(?:about)\b~', $test)) {         echo '<br />'.$about;     } else if (preg_match('~\b(?:projects?|works?)\b~i', $test)) {         echo '<br />'.$projects;     } else if (preg_match('~\b(?:contact|email|inquiry)\b~', $test)) {         echo '<br />'.$contact;     } else {         echo "<br />error!";     } } 

for example, if user types projects input, $projects echo's correctly, after if user types about, $about show, previous projects message disappears.

what have tried:

• i've tried put each if in own isset.
• thought loop makes new input after every message, although believe not efficient use of php, need find more minimal way.

you use ajax old messages won't disappear on submit.

have <ul> chat messages. when user posts, create <li> message , 1 answer, , keep adding them...