C:/xampp/htdocs/moodle/mod/chat/gui_sockets/chatinput.php

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<?php

define('NO_MOODLE_COOKIES', true); // session not used here

require('../../../config.php');
require('../lib.php');

$chat_sid = required_param('chat_sid', PARAM_ALPHANUM);

$PAGE->set_url('/mod/chat/gui_sockets/chatinput.php', array('chat_sid'=>$chat_sid));

if (!$chatuser = $DB->get_record('chat_users', array('sid'=>$chat_sid))) {
    print_error('notlogged', 'chat');
}

//Get the user theme
$USER = $DB->get_record('user', array('id'=>$chatuser->userid));

//Setup course, lang and theme
$PAGE->set_course($DB->get_record('course', array('id' => $chatuser->course)));
$PAGE->requires->js('/mod/chat/gui_sockets/chat_gui_sockets.js', true);
$PAGE->requires->js_function_call('setfocus');
$PAGE->set_focuscontrol('chat_message');
$PAGE->set_cacheable(false);
echo $OUTPUT->header();

?>

    <form action="../empty.php" method="get" target="empty" id="inputform"
          onsubmit="return empty_field_and_submit();">
        <input type="text" name="chat_message" id="chat_message" size="60" value="" />
        <?php echo $OUTPUT->help_icon('usingchat', 'chat'); ?>
    </form>

    <form action="<?php echo "http://$CFG->chat_serverhost:$CFG->chat_serverport/"; ?>" method="get" target="empty" id="sendform">
        <input type="hidden" name="win" value="message" />
        <input type="hidden" name="chat_message" value="" />
        <input type="hidden" name="chat_msgidnr" value="0" />
        <input type="hidden" name="chat_sid" value="<?php echo $chat_sid ?>" />
    </form>
<?php
    echo $OUTPUT->footer();
?>