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∞ PNG transparent 1x1px generator
<?php /***************************************************************** * Script for automatic generation of one pixel * alpha-transparent images for non-RGBA browsers. * @author Lea Verou * @version 1.0 beta * Licensed under a MIT license *****************************************************************/ ######## SETTINGS ############################################################## /** * Enter the directory in which to store cached color images. * This should be relative and SHOULD contain a trailing slash. * The directory you specify should exist and be writeable (CHMOD 666 or 777). * If you want to store the pngs at the same directory, leave blank (''). */ define('COLORDIR', 'rgba/'); /** * If you requently use a color with varying alphas, you can name it * below, to save you some typing and make your CSS easier to read. */ $color_names = array( 'white' => array(255,255,255), 'black' => array(0,0,0) // , 'mycolor' => array(red value, green value, blue value) ); /** * If you don't want the generated pngs to be stored in the server, set the following to * false. This is STRONGLY NOT RECOMMENDED. It's here only for testing/debugging purposes. */ define('CACHEPNGS', true); ######## NO FURTHER EDITING, UNLESS YOU REALLY KNOW WHAT YOU'RE DOING ########## $dir = substr(COLORDIR,0,strlen(COLORDIR)-1); if(!is_writable($dir)) { die("The directory '$dir' either doesn't exist or isn't writable."); } $rgb = $color_names[$_GET['name']]; $red = is_array($rgb)? $rgb[0] : intval($_GET['r']); $green = is_array($rgb)? $rgb[1] : intval($_GET['g']); $blue = is_array($rgb)? $rgb[2] : intval($_GET['b']); $alphaurl = $_GET['a']; // "A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent." // http://www.php.net/manual/en/function.imagecolorallocatealpha.php $alpha = intval(127 - 127 * ($alphaurl / 100)); // Does it already exist? $filepath = COLORDIR . "r{$red}_g{$green}_b{$blue}_a{$alphaurl}.png"; if(/*CACHEPNGS and */file_exists($filepath)) { $url = "http://{$_SERVER['HTTP_HOST']}/{$filepath}"; header("Status: 301"); die(header("Location: {$url}")); } else { // Send headers header('Content-Type: image/png'); header("Expires: ".gmdate("D, d M Y H:i:s", strtotime('+5 years'))." GMT"); $img = @imagecreatetruecolor(1,1) or die('Cannot Initialize new GD image stream'); // This is to allow the final image to have actual transparency // http://www.php.net/manual/en/function.imagesavealpha.php imagealphablending($img, false); imagesavealpha($img, true); // Allocate our requested color $color = imagecolorallocatealpha($img, $red, $green, $blue, $alpha); // Fill the image with it imagefill($img,0,0,$color); // Save the file imagepng($img,$filepath,0,NULL); // Serve the file imagepng($img); flush(); // Free up memory imagedestroy($img); } ?>