This is both an update and a news about my little Phomet project.
I am sorry because I have not found time to write better examples or to explain possibilities as well, but I am sure you would like to know that now the project is called Phico (click there to download them)
See you as soon as possible to talk again about Phico :geek:
Sunday, April 27, 2008
Monday, April 21, 2008
Phomet - PHP Comet tiny library
Comet is a particular technique to interact asyncronously with the client.
Instead of perform a lot of calls using Ajax (polling) the server is able to send to client, whenever it wants, a generic response.
Unfortunately in the PHP world there's no simple way to implement this kind of technique and I'll write more posts to explain better how to implement this library and what is generally possible to do, or not possible yet, with Comet idea inside a dedicated PHP environment.
At the moment, the only thing you can do is read documentation inside JavaScript and PHP files (truly few lines) and test the first basic example, a server side clock in less than 30 lines of mixed code.
As last information, Phomet comes with all necessary to be optimized on client, and its final result is about 1.57Kb on client, and ridiculously 4.52 Kb on server, comments included :)
Here is the download, unpack them into your localhost, and go into phomet folder to view the first demo.
Compatibility? I've tested them with IE6, 7, 8, Opera 9, FireFox 1.5, 2, 3, Safari 3 windows but I am sure there are other browsers compatible.
I am waiting for your suggestions, bugs, opinions, whatever :D
Cheers, and please stay tuned for next Comet appointments :geek:
Instead of perform a lot of calls using Ajax (polling) the server is able to send to client, whenever it wants, a generic response.
Unfortunately in the PHP world there's no simple way to implement this kind of technique and I'll write more posts to explain better how to implement this library and what is generally possible to do, or not possible yet, with Comet idea inside a dedicated PHP environment.
At the moment, the only thing you can do is read documentation inside JavaScript and PHP files (truly few lines) and test the first basic example, a server side clock in less than 30 lines of mixed code.
As last information, Phomet comes with all necessary to be optimized on client, and its final result is about 1.57Kb on client, and ridiculously 4.52 Kb on server, comments included :)
Here is the download, unpack them into your localhost, and go into phomet folder to view the first demo.
Compatibility? I've tested them with IE6, 7, 8, Opera 9, FireFox 1.5, 2, 3, Safari 3 windows but I am sure there are other browsers compatible.
I am waiting for your suggestions, bugs, opinions, whatever :D
Cheers, and please stay tuned for next Comet appointments :geek:
Monday, April 14, 2008
Script Type PHP :)
Update 2008/03/15
I have removed preg_replace and added DOM classes to parse and manage, in a better way, script nodes that contain php code.
Everything inside a simple PHP 5 compatible class.
Finally, please remember that this is a layer between <?php ?> and JavaScript, and only an experiment ;)
Here you can read another example, where difference between server, output, and client, should be more clear than precedent one.
-------------------------------
This is a little experiment to emulate script tag with php.
The final result will be something like this one:
How can it be possible?
Of course, we need to include this file before we write a single character in the layout (spaces included), so basically to obtain the expected result, just save above code in a file called, for example, php_script_handler.php, and put them before the layout
The evil eval? Yes, absolutely ... but first of all, this is only a simple experiment, secondly, the page will not be sent before evaluation, so there's no way from the client side to inject malicious code.
The main problem is true interoperability between these two languages, JavaScript, and PHP, but did I say that this is only an experiment? :P
I have removed preg_replace and added DOM classes to parse and manage, in a better way, script nodes that contain php code.
Everything inside a simple PHP 5 compatible class.
Finally, please remember that this is a layer between <?php ?> and JavaScript, and only an experiment ;)
Here you can read another example, where difference between server, output, and client, should be more clear than precedent one.
<?php require 'PHPScriptHandler.php'; ?>
<html>
<head>
<title>Hello PHP World</title>
<script type="text/php" author="andr3a">
// here we are between the server and output, known as client
$hello = ucwords('hello php world');
// imagine that we would like to use a variable
// defined somewhere in the server
global $something;
// we could even include or require php files
// perform database operations and everything else
</script>
<script type="text/javascript">
onload = function(){
// here we are in the client, on window load event
alert($hello);
alert($something);
};
</script>
</head>
<body>
<?php
// here we are in the server side
// we could do what we do every day without problems
$something = '<div>Hello Body</div>';
echo $something;
?>
</body>
</html>
-------------------------------
This is a little experiment to emulate script tag with php.
The final result will be something like this one:
<html>
<head>
<title>Hello PHP World</title>
<script type="text/php">
// string
$hello = ucwords('hello php world');
// object
$o = new stdClass;
$o->test = 'hello again';
</script>
<script type="text/javascript">
onload = function(){
alert($hello);
alert($o.test);
};
</script>
</head>
<body>
</body>
</html>
How can it be possible?
<?php // 5 - PHP Script Handler Experiment - by Andrea Giammarchi
function php_script_handler($output){return stripos($output, 'type="text/php"') ? preg_replace_callback('#(?i)<script[[:space:]]+type="text/php"(.*?)>([^\a]+?)</script>#', 'php_script_parser', $output) : $output;}
function php_script_parser(){eval(end(func_get_arg(0)));return '<script type="text/javascript"'.next(func_get_arg(0)).'>'.PHP_EOL.php_script_vars(get_defined_vars()).PHP_EOL.'</script>';}
function php_script_vars($vars){foreach($vars as $key => $value)$vars[$key] = '$'.$key.'='.json_encode($value).';';return implode(PHP_EOL, $vars);}
ob_start('php_script_handler');
?>
Of course, we need to include this file before we write a single character in the layout (spaces included), so basically to obtain the expected result, just save above code in a file called, for example, php_script_handler.php, and put them before the layout
<?php require 'php_script_handler.php'; ?>
<html>
<head>
<title>Hello PHP World</title>
.... other stuff ....
The evil eval? Yes, absolutely ... but first of all, this is only a simple experiment, secondly, the page will not be sent before evaluation, so there's no way from the client side to inject malicious code.
The main problem is true interoperability between these two languages, JavaScript, and PHP, but did I say that this is only an experiment? :P
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