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Chat Daemon Written In PHP
<?php/* PHP Word Cloud Generator Example/* --- BEGIN PHP CODE --- */
$stopwords = "able,about,above,according,accordingly,
a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
$stopwords = explode(",", $stopwords);
/* Builds an array of words with all stop words filtered out. (case-insensitive) */
/* Builds an array of words with all stop words filtered out. (case-insensitive) */
function filter_stopwords($words, $stopwords) {
foreach ($words as $pos => $word) {
if (!in_array(strtolower($word), $stopwords, TRUE)) {
$filtered_words[$pos] = $word;
}
}
return $filtered_words;
}
/* Builds an array of words as keys and their frequency as the value. (case-insensitive) */
/* Builds an array of words as keys and their frequency as the value. (case-insensitive) */
function word_freq($words) {
$frequency_list = array();
foreach ($words as $pos => $word) {
$word = strtolower($word);
if (array_key_exists($word, $frequency_list)) {
++$frequency_list[$word];
}
else {
$frequency_list[$word] = 1;
}
}
return $frequency_list;
}
/* Optional function to filter out words below a specific frequency. */
/* Optional function to filter out words below a specific frequency. */
function freq_filter($words, $filter) {
return array_filter(
$words,
function($v) use($filter) {
if ($v >= $filter) return $v;
}
);
}
/* Builds the word cloud and returns a string containing a div of the word cloud. */
/* Builds the word cloud and returns a string containing a div of the word cloud. */
function word_cloud($words, $div_size = 400) {
$tags = 0;
$cloud = "<div style=\"width: {$div_size}px\">";
/* This word cloud generation algorithm was taken from the Wikipedia page on "word cloud"
with some minor modifications to the implementation */
/* Initialize some variables */
$fmax = 96; /* Maximum font size */
$fmin = 8; /* Minimum font size */
$tmin = min($words); /* Frequency lower-bound */
$tmax = max($words); /* Frequency upper-bound */
foreach ($words as $word => $frequency) {
if ($frequency > $tmin) {
$font_size = floor( ( $fmax * ($frequency - $tmin) ) / ( $tmax - $tmin ) );
/* Define a color index based on the frequency of the word */
$r = $g = 0; $b = floor( 255 * ($frequency / $tmax) );
$color = '#' . sprintf('%02s', dechex($r)) . sprintf('%02s', dechex($g)) . sprintf('%02s', dechex($b));
}
else {
$font_size = 0;
}
if ($font_size >= $fmin) {
$cloud .= "<span style=\"font-size: {$font_size}px; color: $color;\">$word</span> ";
$tags++;
}
}
$cloud .= "</div>";
return array($cloud, $tags);
}
if (strtoupper($_SERVER['REQUEST_METHOD']) == 'POST' && $_POST['text'] != '') {
if (strtoupper($_SERVER['REQUEST_METHOD']) == 'POST' && $_POST['text'] != '') {
/* If the request verb is POST and the appropriate field is supplied and isn't
empty, we will attempt to generate the word cloud. */
$text = $_POST['text']; /* Get the posted text */
$words = str_word_count($text, 1); /* Generate list of words */
$word_count = count($words); /* Word count */
$unique_words = count( array_unique($words) ); /* Unique word count */
$words_filtered = filter_stopwords($words, $stopwords); /* Filter out stop words from the word list */
$word_frequency = word_freq($words_filtered); /* Build a word frequency list */
/* Optionally, you can filter out words below a specific frequency... Uncomment the line below to do so */
/* $word_frequency = freq_filter($word_frequency, 3); */
$word_c = word_cloud($word_frequency); /* Generate a word cloud and get number of tags */
$word_cloud = $word_c[0]; /* The word cloud */
$tags = $word_c[1]; /* The number of tags in the word cloud*/
}
else {
/* Otherwise there is nothing to do... */
$text = "";
$word_count = $unique_words = $tags = 0;
$word_cloud = null;
}
/* --- END PHP CODE --- */
?>
/* --- END PHP CODE --- */
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>PHP Word Cloud Generator Example - By Sherif Ramadan - sheriframadan.com</title>
</head>
<body>
<form method="post" action="">
<textarea cols="100" rows="15" name="text"></textarea>
<br />
<input type="submit" value="Generate Word Cloud" />
</form>
<p><b>Number of words found:</b> <?php echo $word_count; ?></p>
<p><b>Number of unique words:</b> <?php echo $unique_words; ?></p>
<p><b>Number of words tagged:</b> <?php echo $tags; ?></p>
<?php echo $word_cloud; ?>
</body>
</html>
PHP Word Cloud Generator
Code
<?php/*
* PHP relay chat daemon -
* To run the daemon in the background from the command line
use `/usr/bin/php server.php > /dev/null 2>&1 & disown` (or similar)*/
if (strtolower(PHP_SAPI) !== 'cli') exit; // The daemon must only be allowed to run in CLI
set_time_limit(0); // Prevent time limit
echo "Daemon starting...\r\n";
/*
* Initialize global variables
*/
$master = array();
$users = array();
$connections = NULL;
$serveraddress = 'sheriframadan.com'; # Enter server address or IP here
$serverport = 10000; # Port to listen on
$serveruri = 'tcp://' . $serveraddress . ':' . $serverport;
$tv_sec = 0;
$tv_usec = 200000; # 200,000 microseconds is the time out on each stream (200ms or 0.2s)
$write = array();
$exceptions = array();
$blocking_mode = 0; # 0 for non-blocking streams and 1 for blocking streams
$usertimeout = 60*15; # default user stream timeout in seconds [default should be 15 minutes]
$peername = NULL; # This will be passed by reference so only use to assign upon new connections
$packetsize = 1024; # Default packet size is set to 1024 bytes
/*
* Initialize listening socket
*/
if (!$socket = stream_socket_server($serveruri, $errno, $errstr)) {
// Catch startup errors here
echo "Error! Unable to start the daemon on [$serveraddress] using port ($serverport).\r\nError #: $errno\r\nError: $errstr\r\n";
exit;
}
stream_set_blocking($socket, $blocking_mode); # Set the stream to non-blocking
echo "Server connected on [$serveraddress] using port ($serverport)!\r\n\r\n";
/*
* Main loop
*/
$master[] = $socket; // Add the servers connection to the listening socket in the master array
$connections = $master;// We copy the master array for now to avoid modifying it
//with stream_select as it's arrays are passed by referencewhile (true) {
$connections = $master; # Make sure we have a fresh copy of the master array in each loop
$numconnections = stream_select($connections, $write, $exceptions, $tv_sec, $tv_usec);
// If an error has been returned by the call to stream_select() we must catch it here
if ($numconnections === FALSE) {
echo "An error occurred capturing the streams.\r\nUnbale to continue work: shutting down...\r\n\r\n";
break;
}
// This is where we read/write to all existing streams and accept new connections
for ($i = 0; $i < $numconnections; $i ++) {
// The connection is made to the listening socket
if ($connections[$i] === $socket) {
$newconnection = stream_socket_accept($socket, $usertimeout, $peername);
$master[] = $newconnection; # Add the new connection to the master array
$users[$peername] = $newconnection; # Define the users peername in the users array
echo "- New connection detected from [$peername]\r\n\r\n";
stream_set_blocking($newconnection, $blocking_mode);
# define the blocking mode for this new connectionif ($socket_data = fread($newconnection, $packetsize)) { // Connection sent data...
$socket_data_bytes = strlen($socket_data);
echo "* Read $socket_data_bytes bytes from [{$peername}]\r\n--- BEGIN MESSAGE --
-\r\n$socket_data\r\n--- END MESSAGE ---\r\n\r\n";unset($socket_data,$socket_data_bytes,$newconnection);
}
// Write welcome message here
list($ip, $port) = explode(':', $peername);
fwrite($newconnection, "Welcome to the PHP server!\r\nI see you are connecting to me using
$serveraddress on port $serverport from IP address $ip on port $port.\r\n");unset($ip, $port);
}
else { // Continue reading from sockets here.
$socket_data = fread($connections[$i], $packetsize);
$socket_data_bytes = strlen($socket_data);
$peer = array_search($connections[$i], $users, TRUE);
$stream = array_search($connections[$i], $master, TRUE);
if ($socket_data_bytes === 0) { // The client probably closed the connection
echo "* Client on [$peer] closed the connection.\r\n- Terminating stream...\r\n\r\n";
fclose($connections[$i]); # Close the client connection
unset($master[$stream],$users[$peer]); # unset variables and continue
}
elseif ($socket_data === FALSE) { // Tere's a problem reading from the socket
echo "- There was a problem reading from [$peer]...\r\n* Closing client connection!\r\n\r\n";
fclose($connections[$i]); # Close the client connection
unset($master[$stream],$users[$peer]); # unset variables and continue
}
else {
$numusers = count($users);
echo "* Read $socket_data_bytes bytes from [$peer]\r\n--- BEGIN MESSAGE --
-\r\n$socket_data\r\n--- END MESSAGE ---\r\n\r\n";// Send the message to all users still connected to the server
foreach ($users as $user) {
fwrite($user, "* [$peer] said: $socket_data\r\n");
}
echo "* Relayed message to $numusers user(s).\r\n\r\n";
unset($user,$numusers);
}
unset($peer, $stream, $socket_data, $socket_data_bytes);
}
}
}
/*
* Handle anything after main loop breaks here
*/
echo "The daemon has been stopped!\r\n\r\n";
?>
Example Usage
To start the daemon from the command line use nohop or disown to background the proccess. Also don't forget to send STDOUT to /dev/null or some designated logging file along with redirecting STDERR to STDOUT.You can use something like `php server.php > /dev/null 2>&1 & disown` or similarly `nohup php server.php > /dev/null 2>&1 &`
You can test connecting to the server by opening a terminal and using telnet. Example: `telnet <server address> <server port>`
Once you telnet in you should see the welcome message and anything you type after that will be relayed to anyone else connected after you hit enter.
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