A normal Fan page of Facebook would like this:

https://www.facebook.com/apps/application.php?id=xxxxxxxxxx&sk=app_XXXXXX

This Url will call your domain, say example.com inside the iframe to load the page.

Each time the iframe is loaded, Facebook do a POST to this iframe URL with some data which we can use to identify the status of the user, eg, whether the user already liked this page, or any other parameter is passed through the fan page url.

Facebook keep app_data variable for developers to pass additional parameters to your iframe page.

eg: https://www.facebook.com/apps/application.php?id=xxxxxxxxxx&sk=app_XXXXXX&app_data=mydata

To retrieve this information, in PHP, use can use the following code:

<?php

if(isset($_REQUEST["signed_request"]))
{

$signed_request = $_REQUEST["signed_request"];
// $_POST also work, but better with $_REQUEST

list($encoded_sig, $payload) = explode(‘.’, $signed_request, 2);

$data = json_decode(base64_decode(strtr($payload, ‘-_’, ‘+/’)), true);

if(isset($data['app_data']))
{
$mydata = $data['app_data']; //here you can get the value you passed
}
}

?>

Check my article here  to see how you can get the ‘like’ status using PHP

Courtesy: From various online sources

Thanks
Sajith

Two months ago, I published a jQuery plugin to record audio from browser (without any Media server) called jRecorder

I got many responses and requests to maintain the code with new enhancements and some bug fixes.

Based on that, a new version (1.1) is released which has the capability to preview the recorded audio before sending to the server.

See the example implementation and documentation here.

Also I made this source open and available for anybody to develop at: https://github.com/sythoos/jRecorder/

Thanks

Sajith

The question is how can we do this ?

The trick here is, you need to create a page using iframe as you usually create FB app. In that iframe, you have your custom page fragment hosted somewhere else showing some copies/contents/offer etc.

Each time when Facebook load your url inside the iframe, Facebook do a POST to your domain signed_request as the parameter. The rest of the part you have to handle with your server side scripting.

Here mine is PHP:

<?php

$signed_request = $_REQUEST["signed_request"];
// $_POST also work, but better with $_REQUEST

list($encoded_sig, $payload) = explode(‘.’, $signed_request, 2);

$data = json_decode(base64_decode(strtr($payload, ‘-_’, ‘+/’)), true);

if (empty($data["page"]["liked"])) {

//write code here to show a non-liked situational contents
echo “You haven’t liked us yet”;

}
else {

//write code here to show contents for already liked people
echo “Hello Fan, here are your offers.”;

}
?>

Recently I made a jQuery plugin named jRecorder to record voice in html pages.

This plugin is very easy to integrate with your web page and you DON’T need a flash server or RED5 server to do the recording

What all you need is a Web Server (PHP or any server scripting language).

You can find the documentation and Download the plugin HERE.

eg: $.jRecorder( settings );

Another advantage is your can decide your recorder design, buttons , mic activity level , recording progress etc in HTML+CSS and this plugin gives you many recording callback events to manage. It is like jPlayer plugin for audio playback.

$.jRecorder ({

   'rec_width': '300',
   'rec_height': '200',
   'rec_top': '0px',
   'rec_left': '0px',
   'recorderlayout_id' : 'flashrecarea',
   'recorder_id' : 'audiorecorder',
   'recorder_name': 'audiorecorder',
   'wmode' : 'transparent',
   'bgcolor': '#ff0000',
   'swf_path': 'jRecorder.swf',
   'host': 'acceptfile.php?filename=hello.wav',
   'callback_started_recording' : function(){},
   'callback_finished_recording' : function(){},
   'callback_stopped_recording': function(){},
   'callback_error_recording' : function(){},
   'callback_activityTime': function(time){},
   'callback_activityLevel' : function(level){}
});

This plugin sends recorded WAV file to your webserver, where you can save this file where ever you wish. You can use FFMPEG tool to convert this WAV to MP3 or any other format for further use

The technology used here is, the plugin uses hidden swf file to record the voice and save the binary data in browser’s cache and when the recording finishes, it sends the data to webserver. Thats why you don’t need any Flash media server to capture the recording on time.

The plugin is good for recording voice less than 180 seconds (3 min), else the time to upload the final data to server takes longer.

Feel free to add comments here if the plugin causes any problem or error.

Those who wish to continue the development, the GIT version is available at: https://github.com/sythoos/jRecorder/

Thanks

Sajith

In PHP coding, we spend most of the time for debugging. Either we use echo, print_r or var_dump to check variable values or check whether a particular function is executing or not.

These all things are outputting something to browser. This is not applicable in case of redirection, or image processing (GD) or sometimes with callback url for Payment integrations.

header(Location: etc);may cause Warning : header is already sent , if you put an echo or debug and you cannot  see the output, since it redirects into some other page.

Here is your remote debugging console to solve these problems. http://vardump.it

Copy the url from the site and use that url for your debugging purpose and keep the console open in another tab.

eg:

<?php

file_get_contents(‘http://vardump.it/253522/inserted-into-database’);  // last part of this url is your debugging message

?>

You can see these messages from your remote console http://vardump.it/253522 (last numbers are your unique key)

The debug url is formatted in this way: http://vardump.it/debug-id/your message here

Email me for more details.

More features like watch, break etc are under development

Here is a php function which returns from and to date as an array for a range:

<?php

function get_rangeof_dates($time_frame = ‘all_time’)

{

$from_date = ”;

$to_date = ”;

switch($time_frame)

{

case ‘all_time’:        $from_date = ’1170-01-01 00:00:00′;

$to_date = ’2250-12-31 23:59:59′;

break;

case ‘today’:

$from_date = date(‘Y-m-d 00:00:00′);

$to_date = date(‘Y-m-d 23:59:59′);

break;

case ‘yesterday’:

$from_date = date(‘Y-m-d 00:00:00′, time()- 24* 60 * 60 );

$to_date = date(‘Y-m-d 23:59:59′, time()- 24* 60 * 60 );

break;

case ‘this_week’:

$from_date = date(‘Y-m-d 00:00:00′, time() – (date(‘w’, time()) * 60 * 60 * 24));

$to_date = date(‘Y-m-d 23:59:59′, time() + ((6 – date(‘w’, time())) * 60* 60 * 24 ));

break;

case ‘last_week’:

$from_date = date(‘Y-m-d 00:00:00′, time() – (date(‘w’, time()) * 60 * 60 * 24) – 7 * 24 * 60 * 60);

$to_date = date(‘Y-m-d 23:59:59′, time() + (( 6 – date(‘w’, time()) ) * 60* 60 * 24 ) – 7 * 24* 60* 60);

break;

case ‘last_7_days’:     $additonal_query = “created_at > ‘”.date(‘Y-m-d’, time()- 7 * 24* 60 * 60 ).“‘”;

$from_date = date(‘Y-m-d 00:00:00′, time()- 7 * 24* 60 * 60 );

$to_date = date(‘Y-m-d 23:59:59′);

break;

case ‘this_month’:

$from_date = date(‘Y-m-d 00:00:00′, mktime( 0, 0, 0, date(“m”)  , 1 , date(“Y”) ) );

$to_date = date(‘Y-m-d 23:59:59′);

break;

case ‘last_month’:

$from_date = date(“Y-m-01 00:00:00″, strtotime(“-1 month”, strtotime(date(“Y-m-d”))));

$to_date = date(“Y-m-d 23:59:59″, strtotime(“-1 day”, strtotime(date(“Y-m-01″))));

break;

case ‘last_30_days’:

$from_date = date(‘Y-m-d 00:00:00′, time()- 30 * 24* 60 * 60 );

$to_date = date(‘Y-m-d 23:59:59′);

break;

case ‘this_quarter’:

$month = date(‘m’);

$year = date(‘Y’);

if($month == 1 || $month == 2 || $month == 3 )

{

$from_date = $year.‘-01-01′;

$to_date = $year.‘-03-31′;

}

elseif($month == 4 || $month == 5|| $month == 6 )

{

$from_date = $year.‘-04-01′;

$to_date = $year.‘-06-30′;

}

elseif($month == 7 || $month == 8|| $month == 9 )

{

$from_date = $year.‘-07-01′;

$to_date = $year.‘-09-30′;

}

else

{

$from_date = $year.‘-10-01′;

$to_date = $year.‘-12-31′;

}

break;

case ‘last_quarter’:

$month = date(‘m’);

$year = date(‘Y’);

if($month == 1 || $month == 2 || $month == 3 )

{

$from_date = ($year -1).‘-10-01′;

$to_date = ($year-1).‘-12-31′;

}

elseif($month == 4 || $month == 5|| $month == 6 )

{

$from_date = $year.‘-01-01′;

$to_date = $year.‘-03-31′;

}

elseif($month == 7 || $month == 8|| $month == 9 )

{

$from_date = $year.‘-04-01′;

$to_date = $year.‘-06-30′;

}

else

{

$from_date = $year.‘-07-01′;

$to_date = $year.‘-09-30′;

}

break;

case ‘this_year’:

$from_date = date(‘Y-01-01 00:00:00′);

$to_date = date(‘Y-12-31 23:59:59′);

break;

case ‘last_year’:

$from_date = date(‘Y-01-01 00:00:00′, mktime( 0, 0, 0, 01 , 01 , date(“Y”) – 1 ));

$to_date = date(‘Y-12-31 23:59:59′, mktime( 0, 0, 0, 12 , 31 , date(“Y”) – 1 ) );

break;

}

return array($from_date, $to_date);

}

?>

In a php project, if we get the requirement , we usually start design and database. But the data entry procedure is very hard. In this case PhpMyadmin is a good comfort. 

Here is another tool from phpguru.org , MySQL Table Editor. Using this library you can make your database table editable from your php code. 

You can  :

1. Select the table to be displayed
2. decide which column should be hidden
3. Whether a column should be editable or not
4. Add advanced searching option
5. Download the table as csv format
6. Add pagination
7. Set alias display name for your column

noDisplay('id');
$editor->noDisplay('password');
//the email column should not be editable
$editor->noEdit('email');
//set display name for column email and login
$editor->setDisplayNames(array('email'       => 'Email',
                              'login'     => 'Username'
                              ));
//sort order of first name
$editor->setDefaultOrderby('namefirst', 0);
//set which are the filed to be searchable
$editor->setConfig('searchableFields', array('namefirst', 'namelast', 'email'));
//can set the type of input field
$editor->setInputType('available', 'select');
//finally display the editor window
$editor->display();
?>

Basically using xajax “You can directly call php functions from your javascript code”

Xajax will do the rest. 

For example, if you are going to write a javascript function Capitalize which captilaze your textbox content when you press a button.

Here is the pure html/javascript code for that:

=============================================

<script>

function Capitalize()

{

      var t = document.getElementById(‘cap’).value;

      document.getElementById(‘update’).innerHTML = t.toUpperCase() ;

}

</script>

<input type=”text” id=”cap” name=”cap” />

<input type=”button” id=”capbutton” value=”Capitalize” onclick=”Capitalize()” />

<div id=”update”></div>

==============================================

Now see the difference when we use xajax, we can write this Capitalize function in php code and can call from javascript.

function Capitalize($value)

{

    $objResponse = new xajaxResponse();

    $objResponse->assign(“update”,”innerHTML”,strtoupper($value));

    return $objResponse;

}

and you can call from your button’s onclick function:

 onclick=”xajax_Capitalize(document.getElementById(‘cap’).value)” 

Here the same functionality we moved from client to server. Thus the point is you can simply call all the functions you written in php (Server Side) from javascript code via onClick, onMouseOver or window.onLoad etc.

You can get the full source code of Capitalize example here:

http://www.sajithmr.com/downloads/capitalize.zip

To download and for documentation go: 

http://xajaxproject.org/

Thanks

Sajith

screen shot

But the zip file i got is not well arranged, so it shows some errors . I arranged it in proper way and uploaded here:

Download:

http://sajithmr.com/downloads/grabber.zip

(Under GNU Public License)

Using this php code , you can export the email contacts as csv file.

Here is the actual source website : http://www.phpclasses.org/browse/package/3895.html

(image after watermarked with gmail logo)

Those who haven’t seen  the online photoshop tool created by me, just click here: http://www.sajithmr.com/photoshop

Today we will implement the watermarking on images using php gd library. Intelligent watermarking means, apply a logo or a watermark image on another image by measuring the color depth of the applied image. For this water marking, use png images as logo or watermark  for better results.

Live example for watermark implementation: http://sajithmr.com/photoshop-tuts/watermark/addwatermark.php

You can see different watermark location by changing the x1,y1 and x2,y2 parameters of the following url:

http://sajithmr.com/photoshop-tuts/watermark/showresult.php?x1=405&y1=285&x2=520&y2=392&width=115&height=107

See the watermark php source code here: http://sajithmr.com/photoshop-tuts/watermark/watermark.class.txt

Download the full-source code of watermarking implementation using php+gd from here: http://sajithmr.com/photoshop-tuts/watermark.rar