Factorial program in c using recursion

#include<stdio.h>
long factorial(int);
int main(){
   int n;
   long f;
   printf("Enter an integer to find factorial\n");
   scanf("%d", &n); 
   if (n < 0)
      printf("Negative integers are not allowed.\n");
   else{
      f = factorial(n);
      printf("%d! = %ld\n", n, f);
   }
   return 0;
}
long factorial(int n){
   if (n == 0)
     return 1;
   else
     return(n * factorial(n-1));
}

Page refresh by using Meta tag http-equiv="refresh"

<meta http-equiv="refresh" content="10" url="http://praba-2011.blogspot.in">
content="10" is after 10 secs page will be auto reload

Input field JQuery float validation, decimal validation

$('#price').keyup(function(e){
      var entered_value = $(this).val();
  var regexPattern = /^\d{0,8}(\.\d{1,2})?$/;         
      //Allow only Number as well 0nly 2 digit after dot(.)
      if(regexPattern.test(entered_value)) {
        alert("false") ;  
      } else {
         alert("true");
      }
});

How to take dates between two dates in php?

   $task_to_do = array();
   echo "
";
   $s = strtotime("START_DATE");
   $d = strtotime("END_DATE");
   $dif = 86400;
   $i=$s;
   $x=0;
   while ($i <= $d) {
      $dat = date("Y-m-d 00:00:00",$i);
      $t_s = date("Y-m-d 00:00:00",strtotime($dat));
      $t_e = date("Y-m-d 23:59:59",strtotime($dat));
      $task_to_do[$x]["start_date"] = $t_s;
      $task_to_do[$x]["end_date"] = $t_e;
      $i = $i+$dif;
      $x++;
   }
   echo "
";
   print_r($task_to_do);

Disable Hotlinking Images from Searchengines with htaccess

The following code is used to prevent HotLinking to jpg, jpeg, gif, png, and bmp file types.

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www.)?your-websitename.com/.*$ [NC]
RewriteRule .(jpg|jpeg|gif|png|bmp)$ - [F]

To add watermark image with original image by using php GD functions

$main_img = "Porsche_911_996_Carrera_4S.jpg"; // main big photo / picture
$watermark_img = "watermark.gif"; // use GIF or PNG, JPEG has no tranparency support
$padding = 80; // distance to border in pixels for watermark image
$opacity = 20; // image opacity for transparent watermark
$watermark = imagecreatefromgif($watermark_img); // create watermark
$image = imagecreatefromjpeg($main_img); // create main graphic
if(!$image || !$watermark) die("Error: main image or watermark could not be loaded!");
$watermark_size = getimagesize($watermark_img);
$watermark_width = $watermark_size[0];
$watermark_height = $watermark_size[1];
$image_size = getimagesize($main_img);
$dest_x = $image_size[0] - $watermark_width - $padding+10;
$dest_y = $image_size[1] - $watermark_height - $padding-80;
// copy watermark on main image
imagecopymerge
($image, $watermark,$dest_x, $dest_y, 0, 0, 
$watermark_width, $watermark_height, $opacity);
// print image to screen
header("content-type: image/jpeg");
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark); 

To Crop image using PHP GD function

cropImage(150,100, 'example.png', 'png', 'image.png');
function cropImage($nw, $nh, $source, $stype, $dest) {
$size = getimagesize($source);
echo "
".$w = 500;
echo "
".$h = 400;
switch($stype) {
case 'gif':
$simg = imagecreatefromgif($source);
break;
case 'jpg':
$simg = imagecreatefromjpeg($source);
break;
case 'png':
$simg = imagecreatefrompng($source);
break;
}
$dimg = imagecreatetruecolor($nw, $nh);
echo "
".$wm = $w/$nw;
echo "
".$hm = $h/$nh;
echo "
".$h_height = $nh/2;
echo "
".$w_height = $nw/2;
if($w> $h) {
echo "
".$adjusted_width = $w / $hm;
echo "
".$half_width = ($adjusted_width / 2)+25;
echo "
".$int_width = $half_width - $w_height;
imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);
}
elseif(($w <$h) || ($w == $h)) {
$adjusted_height = $h / $wm;
$half_height = $adjusted_height / 2;
$int_height = $half_height - $h_height;
imagecopyresampled($dimg,$simg,0,-$int_height,0,0,$nw,$adjusted_height,$w,$h);
} else {
imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
}

imagejpeg($dimg,$dest,100);
}