Rotating images

flickering_images.php

<?php
/* 
   Original script written by
   Simon Holywell (simonholywell.com)
   17/3/2006
   
   You may use this script for any purpose.  You can
   make changes to the code.  You may NOT redistribute
   the code, link back to my site.  All derivatives
   must be released and opensource.
   
   THIS NOTICE MUST ALWAYS APPEAR AT THE VERY TOP
   OF THE SCRIPT NO MATTER HOW MODIFIED IT IS.
*/

/*  Setup vars below
  ------------------------------------------ */
define('BASE_DIR', '/path/to/base/');  //base absolute path to this script
define('FILE_NAME', 'alfa'); //filename w/o the extension or number
define('IMAGE_PATH', BASE_DIR.'images/'.FILE_NAME); //where images are stored
define('FILE_SUFFIX', '.jpg'); //suffix (usually the extension of the images)
define('IMAGE_COUNT', 20); //number of images
define('DATA_FILE', BASE_DIR.'storage.dat'); //the file where the data is stored

/* File management
  ------------------------------------------ */
if(file_exists(DATA_FILE) && is_readable(DATA_FILE) && is_writable(DATA_FILE))
	$storage = fopen(DATA_FILE, "r+");
else
	$storage = @fopen(DATA_FILE, "w+");

if(!$storage) {
	print 'Error: You must make the data file readable (chmod 777) and it must exist!';
	exit();
}
	
// get the serialized array
$image_data = array();
$data = implode("", @file(DATA_FILE));
$image_data = unserialize($data);

// add one to move to the next image
if($image_data['position']++ >= IMAGE_COUNT)
	$image_data['position'] = 1;

// hit counter
$image_data['hit_counter']++;

// wipe files contents
@fseek($storage, 0); // move back to the beginning of the file
@ftruncate($storage, 0);  //leave 0 bytes in the file from this point

// stick the data back in the file
$data = serialize($image_data);
$data = @fputs($storage, $data);
@fclose($storage);

if(!$data){
	print 'Error: Could not write the data back to the file.  Please make sure that it exists and is chmod\'d to 777.';
	exit();
}

// verify the required image exists
if(!file_exists(IMAGE_PATH.$image_data['position'].FILE_SUFFIX)) {
	print 'Error: Image ('.IMAGE_PATH.$image_data['position'].FILE_SUFFIX.') cannot be found.  Please ensure that you have set the correct number of images and that image directory is readable.';
	exit();
}

// tell the user's browser that it is an image
header("Content-type: image/jpeg");

/* Image Manipulation
  ------------------------------------------ */
// load the image from your selection of images
$image = imagecreatefromjpeg(IMAGE_PATH.$image_data['position'].FILE_SUFFIX);
$size = getimagesize(IMAGE_PATH.$image_data['position'].FILE_SUFFIX); // Read the size

// allocate the text colours
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);

// define the font, x position, y postition
$font = 2;
$x = 5;
$y = $size[1] - 17;  // equivalent to 17px from the base of the image

// write hit counter (shadow first and then the white)
imagestring($image, $font, $x + 2, $y + 2, 'Views: '.$image_data['hit_counter'], $black);
imagestring($image, $font, $x, $y, 'Views: '.$image_data['hit_counter'], $white);

// write the current position of the slideshow to the image
// obviously you will have to take more off of x if you have more
// than 100 images other wise the zero will be off "screen"
imagestring($image, $font, $size[0] - 50, $y + 2, $image_data['position'].' of '.IMAGE_COUNT, $black);
imagestring($image, $font, $size[0] - 52, $y, $image_data['position'].' of '.IMAGE_COUNT, $white);

/* Output image
  ------------------------------------------ */
imagejpeg($image);
imagedestroy($image);
?>