A super easy PHP Framework for web development!
https://github.com/exacti/phacil-framework
322 lines
12 KiB
322 lines
12 KiB
6 years ago
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<?php
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/* PROJECT INFO --------------------------------------------------------------------------------------------------------
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Version: 1.5.2
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Changelog: http://adaptive-images.com/changelog.txt
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Homepage: http://adaptive-images.com
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GitHub: https://github.com/MattWilcox/Adaptive-Images
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Twitter: @responsiveimg
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LEGAL:
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Adaptive Images by Matt Wilcox is licensed under a Creative Commons Attribution 3.0 Unported License.
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/* CONFIG ----------------------------------------------------------------------------------------------------------- */
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$resolutions = array(1382, 992, 768, 480); // the resolution break-points to use (screen widths, in pixels)
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$cache_path = "ai-cache"; // where to store the generated re-sized images. Specify from your document root!
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$jpg_quality = 85; // the quality of any generated JPGs on a scale of 0 to 100
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$sharpen = TRUE; // Shrinking images can blur details, perform a sharpen on re-scaled images?
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$watch_cache = TRUE; // check that the adapted image isn't stale (ensures updated source images are re-cached)
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$browser_cache = 60*60*24*7; // How long the BROWSER cache should last (seconds, minutes, hours, days. 7days by default)
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/* END CONFIG ----------------------------------------------------------------------------------------------------------
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------------------------ Don't edit anything after this line unless you know what you're doing -------------------------
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--------------------------------------------------------------------------------------------------------------------- */
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/* get all of the required data from the HTTP request */
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$document_root = $_SERVER['DOCUMENT_ROOT'];
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$requested_uri = parse_url(urldecode($_SERVER['REQUEST_URI']), PHP_URL_PATH);
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$requested_file = basename($requested_uri);
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$source_file = $document_root.$requested_uri;
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$resolution = TRUE;
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/* Mobile detection
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NOTE: only used in the event a cookie isn't available. */
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function is_mobile() {
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$userAgent = strtolower($_SERVER['HTTP_USER_AGENT']);
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return strpos($userAgent, 'mobile');
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}
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/* Does the UA string indicate this is a mobile? */
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if(!is_mobile()){
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$is_mobile = FALSE;
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} else {
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$is_mobile = TRUE;
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}
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// does the $cache_path directory exist already?
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if (!is_dir("$document_root/$cache_path")) { // no
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if (!mkdir("$document_root/$cache_path", 0755, true)) { // so make it
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if (!is_dir("$document_root/$cache_path")) { // check again to protect against race conditions
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// uh-oh, failed to make that directory
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sendErrorImage("Failed to create cache directory at: $document_root/$cache_path");
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}
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}
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}
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/* helper function: Send headers and returns an image. */
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function sendImage($filename, $browser_cache) {
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$extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
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if (in_array($extension, array('png', 'gif', 'jpeg'))) {
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header("Content-Type: image/".$extension);
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} else {
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header("Content-Type: image/jpeg");
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}
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header("Cache-Control: private, max-age=".$browser_cache);
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header('Expires: '.gmdate('D, d M Y H:i:s', time()+$browser_cache).' GMT');
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header('Content-Length: '.filesize($filename));
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readfile($filename);
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exit();
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}
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/* helper function: Create and send an image with an error message. */
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function sendErrorImage($message) {
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/* get all of the required data from the HTTP request */
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$document_root = $_SERVER['DOCUMENT_ROOT'];
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$requested_uri = parse_url(urldecode($_SERVER['REQUEST_URI']), PHP_URL_PATH);
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$requested_file = basename($requested_uri);
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$source_file = $document_root.$requested_uri;
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if(!is_mobile()){
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$is_mobile = "FALSE";
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} else {
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$is_mobile = "TRUE";
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}
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$im = ImageCreateTrueColor(800, 300);
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$text_color = ImageColorAllocate($im, 233, 14, 91);
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$message_color = ImageColorAllocate($im, 91, 112, 233);
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ImageString($im, 5, 5, 5, "Adaptive Images encountered a problem:", $text_color);
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ImageString($im, 3, 5, 25, $message, $message_color);
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ImageString($im, 5, 5, 85, "Potentially useful information:", $text_color);
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ImageString($im, 3, 5, 105, "DOCUMENT ROOT IS: $document_root", $text_color);
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ImageString($im, 3, 5, 125, "REQUESTED URI WAS: $requested_uri", $text_color);
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ImageString($im, 3, 5, 145, "REQUESTED FILE WAS: $requested_file", $text_color);
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ImageString($im, 3, 5, 165, "SOURCE FILE IS: $source_file", $text_color);
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ImageString($im, 3, 5, 185, "DEVICE IS MOBILE? $is_mobile", $text_color);
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header("Cache-Control: no-store");
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header('Expires: '.gmdate('D, d M Y H:i:s', time()-1000).' GMT');
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header('Content-Type: image/jpeg');
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ImageJpeg($im);
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ImageDestroy($im);
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exit();
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}
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/* sharpen images function */
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function findSharp($intOrig, $intFinal) {
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$intFinal = $intFinal * (750.0 / $intOrig);
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$intA = 52;
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$intB = -0.27810650887573124;
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$intC = .00047337278106508946;
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$intRes = $intA + $intB * $intFinal + $intC * $intFinal * $intFinal;
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return max(round($intRes), 0);
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}
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/* refreshes the cached image if it's outdated */
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function refreshCache($source_file, $cache_file, $resolution) {
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if (file_exists($cache_file)) {
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// not modified
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if (filemtime($cache_file) >= filemtime($source_file)) {
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return $cache_file;
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}
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// modified, clear it
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unlink($cache_file);
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}
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return generateImage($source_file, $cache_file, $resolution);
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}
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/* generates the given cache file for the given source file with the given resolution */
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function generateImage($source_file, $cache_file, $resolution) {
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global $sharpen, $jpg_quality;
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$extension = strtolower(pathinfo($source_file, PATHINFO_EXTENSION));
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// Check the image dimensions
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$dimensions = GetImageSize($source_file);
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$width = $dimensions[0];
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$height = $dimensions[1];
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// Do we need to downscale the image?
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if ($width <= $resolution) { // no, because the width of the source image is already less than the client width
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return $source_file;
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}
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// We need to resize the source image to the width of the resolution breakpoint we're working with
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$ratio = $height/$width;
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$new_width = $resolution;
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$new_height = ceil($new_width * $ratio);
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$dst = ImageCreateTrueColor($new_width, $new_height); // re-sized image
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switch ($extension) {
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case 'png':
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$src = @ImageCreateFromPng($source_file); // original image
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break;
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case 'gif':
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$src = @ImageCreateFromGif($source_file); // original image
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break;
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default:
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$src = @ImageCreateFromJpeg($source_file); // original image
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ImageInterlace($dst, true); // Enable interlancing (progressive JPG, smaller size file)
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break;
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}
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if($extension=='png'){
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imagealphablending($dst, false);
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imagesavealpha($dst,true);
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$transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);
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imagefilledrectangle($dst, 0, 0, $new_width, $new_height, $transparent);
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}
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ImageCopyResampled($dst, $src, 0, 0, 0, 0, $new_width, $new_height, $width, $height); // do the resize in memory
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ImageDestroy($src);
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// sharpen the image?
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// NOTE: requires PHP compiled with the bundled version of GD (see http://php.net/manual/en/function.imageconvolution.php)
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if($sharpen == TRUE && function_exists('imageconvolution')) {
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$intSharpness = findSharp($width, $new_width);
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$arrMatrix = array(
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array(-1, -2, -1),
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array(-2, $intSharpness + 12, -2),
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array(-1, -2, -1)
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);
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imageconvolution($dst, $arrMatrix, $intSharpness, 0);
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}
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$cache_dir = dirname($cache_file);
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// does the directory exist already?
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if (!is_dir($cache_dir)) {
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if (!mkdir($cache_dir, 0755, true)) {
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// check again if it really doesn't exist to protect against race conditions
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if (!is_dir($cache_dir)) {
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// uh-oh, failed to make that directory
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ImageDestroy($dst);
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sendErrorImage("Failed to create cache directory: $cache_dir");
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}
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}
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}
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if (!is_writable($cache_dir)) {
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sendErrorImage("The cache directory is not writable: $cache_dir");
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}
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// save the new file in the appropriate path, and send a version to the browser
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switch ($extension) {
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case 'png':
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$gotSaved = ImagePng($dst, $cache_file);
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break;
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case 'gif':
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$gotSaved = ImageGif($dst, $cache_file);
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break;
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default:
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$gotSaved = ImageJpeg($dst, $cache_file, $jpg_quality);
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break;
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}
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ImageDestroy($dst);
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if (!$gotSaved && !file_exists($cache_file)) {
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sendErrorImage("Failed to create image: $cache_file");
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}
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return $cache_file;
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}
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// check if the file exists at all
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if (!file_exists($source_file)) {
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header("Status: 404 Not Found");
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exit();
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}
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/* check that PHP has the GD library available to use for image re-sizing */
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if (!extension_loaded('gd')) { // it's not loaded
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if (!function_exists('dl') || !dl('gd.so')) { // and we can't load it either
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// no GD available, so deliver the image straight up
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trigger_error('You must enable the GD extension to make use of Adaptive Images', E_USER_WARNING);
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sendImage($source_file, $browser_cache);
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}
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}
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/* Check to see if a valid cookie exists */
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if (isset($_COOKIE['resolution'])) {
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$cookie_value = $_COOKIE['resolution'];
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// does the cookie look valid? [whole number, comma, potential floating number]
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if (! preg_match("/^[0-9]+[,]*[0-9\.]+$/", "$cookie_value")) { // no it doesn't look valid
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setcookie("resolution", "$cookie_value", time()-100); // delete the mangled cookie
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}
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else { // the cookie is valid, do stuff with it
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$cookie_data = explode(",", $_COOKIE['resolution']);
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$client_width = (int) $cookie_data[0]; // the base resolution (CSS pixels)
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$total_width = $client_width;
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$pixel_density = 1; // set a default, used for non-retina style JS snippet
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if (@$cookie_data[1]) { // the device's pixel density factor (physical pixels per CSS pixel)
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$pixel_density = $cookie_data[1];
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}
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rsort($resolutions); // make sure the supplied break-points are in reverse size order
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$resolution = $resolutions[0]; // by default use the largest supported break-point
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// if pixel density is not 1, then we need to be smart about adapting and fitting into the defined breakpoints
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if($pixel_density != 1) {
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$total_width = $client_width * $pixel_density; // required physical pixel width of the image
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// the required image width is bigger than any existing value in $resolutions
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if($total_width > $resolutions[0]){
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// firstly, fit the CSS size into a break point ignoring the multiplier
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foreach ($resolutions as $break_point) { // filter down
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if ($total_width <= $break_point) {
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$resolution = $break_point;
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}
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}
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// now apply the multiplier
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$resolution = $resolution * $pixel_density;
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}
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// the required image fits into the existing breakpoints in $resolutions
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else {
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foreach ($resolutions as $break_point) { // filter down
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if ($total_width <= $break_point) {
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$resolution = $break_point;
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}
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}
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}
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}
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else { // pixel density is 1, just fit it into one of the breakpoints
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foreach ($resolutions as $break_point) { // filter down
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if ($total_width <= $break_point) {
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$resolution = $break_point;
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}
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}
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}
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}
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}
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/* No resolution was found (no cookie or invalid cookie) */
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if (!$resolution) {
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// We send the lowest resolution for mobile-first approach, and highest otherwise
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$resolution = $is_mobile ? min($resolutions) : max($resolutions);
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}
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/* if the requested URL starts with a slash, remove the slash */
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if(substr($requested_uri, 0,1) == "/") {
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$requested_uri = substr($requested_uri, 1);
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}
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/* whew might the cache file be? */
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$cache_file = $document_root."/$cache_path/$resolution/".$requested_uri;
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/* Use the resolution value as a path variable and check to see if an image of the same name exists at that path */
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if (file_exists($cache_file)) { // it exists cached at that size
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if ($watch_cache) { // if cache watching is enabled, compare cache and source modified dates to ensure the cache isn't stale
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$cache_file = refreshCache($source_file, $cache_file, $resolution);
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}
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sendImage($cache_file, $browser_cache);
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}
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/* It exists as a source file, and it doesn't exist cached - lets make one: */
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$file = generateImage($source_file, $cache_file, $resolution);
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sendImage($file, $browser_cache);
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