draw_upc_barcode    version 0.3    Draw a barcode for a UPC number.
Category: Algorithm
eXorithm – Execute Algorithm: Recently Updated Algorithms
eXorithm – Execute Algorithm: View / Run Algorithm sort_multi_array
function sort_multi_array ($array, $key
{
$keys = array();
for ($i=1;$ifunc_num_args();$i++) {
$keys$i-1] = func_get_arg$i);
}
// create a custom search function to pass to usort
$func = function ($a, $b) use ($keys) {
for ($i=0;$icount$keys);$i++) {
if ($a$keys$i]] != $b$keys$i]]) {
return ($a$keys$i]] < $b$keys$i]]) ? -1 : 1;
}
}
return 0;
};
usort$array, $func);
return $array
}
Overlay Image
<?php
/**
* overlay_image
*
* Overlay a transparent image on top of another image.
*
* @version 0.2
* @author Contributors at eXorithm
* @link /algorithm/view/overlay_image Listing at eXorithm
* @link /algorithm/history/overlay_image History at eXorithm
* @license /home/show/license
*
* @param resource $base (GD image)
* @param resource $image (GD image)
* @return mixed
*/
function overlay_image($base=null,$image=null)
{
$h = imagesy($image);
$w = imagesx($image);
imagealphablending($base, true);
imagesavealpha($base, true);
imagecopy($base, $image, 0, 0, 0, 0, $w, $h);
return $base;
}
?>
eXorithm – Execute Algorithm: View / Run Algorithm equilateral_shape
function equilateral_shape ($radius, $sides, $color
{
// blank image
$image = image_create_alpha$radius*2+4, $radius*2+4);
// create the color
$r = hexdecsubstr$color, 0, 2));
$g = hexdecsubstr$color, 2, 2));
$b = hexdecsubstr$color, 4, 2));
$color = imagecolorallocate$image, $r, $g, $b);
// The fudge factor is only used to rotate the shape so a flat
// line is at the bottom.
if (($sides%2)==0) {
if (($sides/2%2)==0) {
$fudge = pi()*1/$sides
} else {
$fudge = 0;
}
} else {
if ((($sides-1)/2%2)==0) {
$fudge = pi()*1.5/$sides
} else {
$fudge = pi()*0.5/$sides
}
}
$x0 = 0;
$y0 = 0;
// for the number of sides...
for ($i=0; $i$sides; $i++) {
// compute a point on the perimeter $i/$sides from the beginning
$x1 = round$radiuscos(2*pi()*$i$sides$fudge)+$radius+2);
$y1 = round$radiussin(2*pi()*$i$sides$fudge)+$radius+2);
if ($i==0) {
// If this is the first point then we can't draw a line yet
// because we don't have a second set of points to connect to.
// However, we need we need these points to connect the last
// set of points to.
$x0 = $x1
$y0 = $y1
} else {
// draw a line
imageline$image, $x1, $y1, $x2, $y2, $color);
}
// remember these points
$x2 = $x1
$y2 = $y1
}
// draw the final line
imageline$image, $x2, $y2, $x0, $y0, $color);
return $image
}
eXorithm – Execute Algorithm: Embed Algorithm stock_ticker
Embed This Algorithm
This page will help you embed the algorithm stock_ticker on a page on your own website. Just configure the inputs, then click the generate button to get a snippet of code you can paste onto your site. You have two options.
- You can embed the entire form. Users will be able to enter their own arguments, and will need to press the run button
to execute the algorithm. - You can add only the output of the algorithm to your website. There will be no argument inputs or run button.
eXorithm – Execute Algorithm: View / Run Algorithm simple_sort
function simple_sort ($array
{
sort$array);
return $array
}
eXorithm – Execute Algorithm: History For Algorithm check_domain
check_domain    version 0.1    Check a domain name against a whitelist and blacklist.
Unique Image
<?php
/**
* unique_image
*
* Generate a pseudo-unique "hash" image based on a string.
*
* @version 0.3
* @author Contributors at eXorithm
* @link /algorithm/view/unique_image Listing at eXorithm
* @link /algorithm/history/unique_image History at eXorithm
* @license /home/show/license
*
* @param mixed $string
* @return resource GD image
*/
function unique_image($string='whatever')
{
$size=200;
$steps=5;
$step=$size/$steps;
$image = image_create_alpha($size, $size);
$n = 0;
$prev = 0;
$len = strlen($string);
$sum = 0;
for ($i=0;$i<$len;$i++) $sum += ord($string[$i]);
for ($i=0;$i<$steps;$i++) {
for ($j=0;$j<$steps;$j++) {
$letter = $string[$n++ % $len];
$u = ($n % (ord($letter)+$sum)) + ($prev % (ord($letter)+$len)) + (($sum-1) % ord($letter));
$color = imagecolorallocate($image, pow($u*$prev+$u+$prev+5,2)%256, pow($u*$prev+$u+$prev+3,2)%256, pow($u*$prev+$u+$prev+1,2)%256);
if (($u%2)==0)
imagefilledpolygon($image, array($i*$step, $j*$step, $i*$step+$step, $j*$step, $i*$step, $j*$step+$step), 3, $color);
$prev = $u;
$u = ($n % (ord($letter)+$len)) + ($prev % (ord($letter)+$sum)) + (($sum-1) % ord($letter));
if (($u%2)==0)
imagefilledpolygon($image, array($i*$step, $j*$step+$step, $i*$step+$step, $j*$step+$step, $i*$step+$step, $j*$step), 3, $color);
$prev = $u;
}
}
return $image;
}
/**
* image_create_alpha
*
* Helper function to create a new blank image with transparency.
*
* @version 0.1
* @author Contributors at eXorithm
* @link /algorithm/view/image_create_alpha Listing at eXorithm
* @link /algorithm/history/image_create_alpha History at eXorithm
* @license /home/show/license
*
* @param mixed $width
* @param mixed $height
* @return resource GD image
*/
function image_create_alpha($width='',$height='')
{
// Create a normal image and apply required settings
$img = imagecreatetruecolor($width, $height);
imagealphablending($img, false);
imagesavealpha($img, true);
// Apply the transparent background
$trans = imagecolorallocatealpha($img, 0, 0, 0, 127);
for ($x = 0; $x < $width; $x++)
{
for ($y = 0; $y < $height; $y++)
{
imagesetpixel($img, $x, $y, $trans);
}
}
return $img;
}
?>
Simple Sort
<?php
/**
* simple_sort
*
* Sort an array and display it.
*
* @version 0.1
* @author Contributors at eXorithm
* @link /algorithm/view/simple_sort Listing at eXorithm
* @link /algorithm/history/simple_sort History at eXorithm
* @license /home/show/license
*
* @param array $array
* @return array
*/
function simple_sort($array=array(0=>'1',1=>'11',2=>'22',3=>'3',4=>'4'))
{
sort($array);
return $array;
}
?>