Hoe to find os by using php?

echo php_uname();
echo PHP_OS;
/* Some possible outputs:
Linux localhost 2.4.21-0.13mdk #1 Fri Mar 14 15:08:06 EST 2003 i686
Linux
FreeBSD localhost 3.2-RELEASE #15: Mon Dec 17 08:46:02 GMT 2001
FreeBSD
Windows NT XN1 5.1 build 2600
WINNT
*/
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
    echo 'This is a server using Windows!';
} else {
    echo 'This is a server not using Windows!';
}

To Calculate distance between two latitude & longitude in php

Method I :

function distance($lat1, $lon1, $lat2, $lon2, $unit) {

  $theta = $lon1 - $lon2;
  $dist = sin(deg2rad($lat1))*sin(deg2rad($lat2))+
cos(deg2rad($lat1))*cos(deg2rad($lat2))*cos(deg2rad($theta));
  $dist = acos($dist);
  $dist = rad2deg($dist);
  $miles = $dist * 60 * 1.1515;
  $unit = strtoupper($unit);

  if ($unit == "K") {
    return ($miles * 1.609344);
  } else if ($unit == "N") {
      return ($miles * 0.8684);
    } else {
        return $miles;
      }
}

echo distance(11.01078,76.93433,11.14137,78.59412,10.1, "M") . " Miles
";
echo distance(11.01078,76.93433,11.14137,78.59412,10.1, "K") . " Kilometers
";
echo distance(11.01078,76.93433,11.14137,78.59412,10.1, "N") . " Nautical Miles
";

Method II:

function calculateDistance($latitude1, $longitude1, $latitude2, $longitude2) {
    $theta = $longitude1 - $longitude2;
    $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + 
(cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
    $miles = acos($miles);
    $miles = rad2deg($miles);
    $miles = $miles * 60 * 1.1515;
    return $miles;
}

How to hidden you IP & proxy?

1. Open Internet Explorer and Select Proxy.
2. Choose Port and Proxy Address, right click on it and copy it.
3. Go to Tools > Internet Options
4. Select Connection Tab and go to LAN Settings.
5. Select Use a proxy server for your LAN in Proxy server
6. Paste Port & Proxy server in Port Box and Address box.
7. Click OK and Exit. 

Resize image by using PHP GD functions

header('Content-Type: image/jpeg');
$w=100;
$h=100;
$filename = 'picture.jpg';
for($i=0;$i<10;$i++){
$rfname="images/re$i.jpg";
resize($filename,$w,$h,$rfname);
}
function resize($filename,$w,$h,$rfname){
list($width, $height) = getimagesize($filename);
$image_p = imagecreatetruecolor($w,$h);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $w, $h, $width, $height);
imagejpeg($image_p,'', 100);
imagejpeg($image_p,$rfname);
}

Basic Linux Commands

1. mkdir - make directories
2. cd - change directories
3. mv- change the name of a directory
   Ex: mv testdir newnamedir
4. pwd - print working directory
   will show you the full path to the directory you are currently in.
   This is very handy to use, especially when performing
   some of the other commands on this page
5. rmdir - Remove an existing directory
6. rm -r
   Removes directories and files within the directories recursively.
7. chown - change file owner and group
8. chmod - change file access permissions
9. reboot - Reboots the system (requires root privileges).
10.ping host - Sends an echo request via TCP/IP to the specified host. A response confirms that the host is operational.

How to read data from excel file using php?

<?php
include 'reader.php';
$excel = new Spreadsheet_Excel_Reader();
?>
<table  border="1">
<?php
$excel->read('sample.xls');//set the excel file name here   
$x=1;
while($x<=$excel->sheets[0]['numRows']) { // reading row by row 
echo "\t<tr>\n";
$y=1;
while($y<=$excel->sheets[0]['numCols']) {// reading column by column 
$cell = isset($excel->sheets[0]['cells'][$x][$y])?$excel->sheets[0]['cells'][$x][$y] :'';
if($cell)
echo "\t\t<td>$cell</td>\n";  // get each cells values
$y++;
}  
echo "\t</tr>\n";
$x++;
}
?>    
</table><br/>

Clock running scripts in php with jquery

<div class="col-xs-12 col-sm-12 col-lg-12 cal">
      <p id='demo' class="text-center cal-container"></p> 
   </div>
                       </a>
                       <?php
   
   $current_timestamp = time();
  ?>
                       <script type='text/javascript'>
                        flag = true;
            timer = '';
            phpJavascriptClock();
            setInterval(function(){phpJavascriptClock();},1000);
 
            function phpJavascriptClock()
            {
               
                if ( flag ) {
                    timer = <?php echo $current_timestamp;?>*1000;
                }
                var d = new Date(timer);
                months = new Array('Jan', 'Feb', 'Mar', 'Apr', 'May', 
'Jun', 'Jul', 'Aug', 'Sept', 'Oct', 'Nov', 'Dec');
 
                month_array = new Array('January', 'Febuary', 'March', 
'April', 'May', 'June', 'July', 'Augest', 'September', 'October', 
'November', 'December');
 
                currentYear = d.getFullYear();
                month = d.getMonth();
                var currentMonth = months[month];
                var currentMonth1 = month_array[month];
                var currentDate = d.getDate();
                currentDate = currentDate < 10 ? '0'+currentDate : currentDate;
 
                var hours = d.getHours();
                var minutes = d.getMinutes();
                var seconds = d.getSeconds();
 
                var ampm = hours >= 12 ? 'PM' : 'AM';
                hours = hours % 12;
                hours = hours ? hours : 12; // the hour ’0' should be ’12'
                minutes = minutes < 10 ? '0'+minutes : minutes;
                seconds = seconds < 10 ? '0'+seconds : seconds;
                var strTime = hours + ':' + minutes+ ':' + seconds + ' ' + ampm;
                document.getElementById("demo").innerHTML= currentMonth+' 
' + currentDate+' , ' + currentYear + ' ' + strTime ;
                flag = false;
                timer = timer + 1000;
            }
                       </script>