我正在尝试使用自适应图像，并且将它与以结尾的普通链接图像一起使用没有问题，.jpg, .png, .gif但是当我使用一个文件系统时，一个 php 文件从目录中抓取一个未扩展的文件并使用标题Content-Disposition: inline来显示图像，htaccess 不会通过php文件正确运行它。
这是适用于普通链接图像的重写规则：
RewriteRule \.(?:jpe?g|gif|png)$ adaptive-images.php [NC,L]
这是需要运行的图像链接的示例adaptive-images.php：
http://localhost/projects/file-system/getmedia.php?id=2&slug=35dq
我如何编写另一个重写规则来处理这些图像？我目前正在使用此规则，但它只会制作损坏的图像（我尝试了一些其他规则但没有区别）：
RewriteRule ^getmedia.php$ adaptive-images.php [NC,L]
尽管我的 htaccess 规则可能有问题，但自适应图像 php 脚本本身并不适应 php 馈送图像。
我使用的 htaccess 规则是：
RewriteCond %{QUERY_STRING} !(^|&)noadaptive=(true)(&|$) [NC]
RewriteRule ^getmedia\.php.*$ adaptive-images.php [NC,L]
这使我可以将所有生成的图像getmedia.php发送到adaptive-images.php其中，如果它具有noadaptive=true作为 get 参数，则它不使用脚本，因此我可以再次获得全尺寸图像。
这是修改后的adaptive-images.php
<?php
//sendErrorImage("there is a problem");
/* PROJECT INFO --------------------------------------------------------------------------------------------------------
Version: 1.5.2
Changelog: http://adaptive-images.com/changelog.txt
Homepage: http://adaptive-images.com
GitHub: https://github.com/MattWilcox/Adaptive-Images
Twitter: @responsiveimg
LEGAL:
Adaptive Images by Matt Wilcox is licensed under a Creative Commons Attribution 3.0 Unported License.
/* CONFIG ----------------------------------------------------------------------------------------------------------- */
/* MODIFICATIONS -------------------------------------------------------------------------------------------------------
Mods by: MLM from VisualPulse.net
Description: Added compatibility for php fed images.
Intended for use with a ambiguous file system that serve the files through a php file
NOTE: These are unofficial modifications I made up to get this wonderful script to work with my file system.
*/
$resolutions = array(1382, 992, 768, 480); // the resolution break-points to use (screen widths, in pixels)
$cache_path = "ai-cache"; // where to store the generated re-sized images. Specify from your document root!
$jpg_quality = 100; // the quality of any generated JPGs on a scale of 0 to 100
$sharpen = TRUE; // Shrinking images can blur details, perform a sharpen on re-scaled images?
$watch_cache = TRUE; // check that the adapted image isn't stale (ensures updated source images are re-cached)
$browser_cache = 60 * 60 * 24 * 7; // How long the BROWSER cache should last (seconds, minutes, hours, days. 7days by default)
/* END CONFIG ----------------------------------------------------------------------------------------------------------
------------------------ Don't edit anything after this line unless you know what you're doing -------------------------
--------------------------------------------------------------------------------------------------------------------- */
/* get all of the required data from the HTTP request */
$document_root = $_SERVER['DOCUMENT_ROOT'];
$requested_uri = parse_url(urldecode($_SERVER['REQUEST_URI']), PHP_URL_PATH);
$requested_uri_more_stuff = parse_url(urldecode($_SERVER['REQUEST_URI']));
$requested_file = basename($requested_uri);
//$source_file = $document_root . $requested_uri;
file_put_contents('array.txt', var_export($requested_uri_more_stuff, TRUE));
if(pathinfo($requested_file, PATHINFO_EXTENSION) == 'php')
$source_file = 'http://' . $_SERVER['HTTP_HOST'] . $requested_uri. ((!empty($requested_uri_more_stuff['query']) ? ('?' . $requested_uri_more_stuff['query']) : '') . (((parse_url($_SERVER['REQUEST_URI'], PHP_URL_QUERY) == NULL) ? '?' : '&') . 'noadaptive=true'));
else
$source_file = $document_root . $requested_uri;
$resolution = FALSE;
//sendErrorImage(pathinfo($requested_file, PATHINFO_EXTENSION));
//sendErrorImage($source_file);
/* Mobile detection
NOTE: only used in the event a cookie isn't available. */
function is_mobile()
{
$userAgent = strtolower($_SERVER['HTTP_USER_AGENT']);
return strpos($userAgent, 'mobile');
}
/* Does the UA string indicate this is a mobile? */
if (!is_mobile()) {
$is_mobile = FALSE;
} else {
$is_mobile = TRUE;
}
// does the $cache_path directory exist already?
if (!is_dir("$document_root/$cache_path")) { // no
if (!mkdir("$document_root/$cache_path", 0755, true)) { // so make it
if (!is_dir("$document_root/$cache_path")) { // check again to protect against race conditions
// uh-oh, failed to make that directory
sendErrorImage("Failed to create cache directory at: $document_root/$cache_path");
}
}
}
/* helper function: Send headers and returns an image. */
function sendImage($filename, $browser_cache)
{
$extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
if (in_array($extension, array('png', 'gif', 'jpeg'))) {
header("Content-Type: image/" . $extension);
} else {
header("Content-Type: image/jpeg");
}
header("Cache-Control: private, max-age=" . $browser_cache);
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $browser_cache) . ' GMT');
header('Content-Length: ' . filesize($filename));
readfile($filename);
exit();
}
/* helper function: Create and send an image with an error message. */
function sendErrorImage($message)
{
/* get all of the required data from the HTTP request */
$document_root = $_SERVER['DOCUMENT_ROOT'];
$requested_uri = parse_url(urldecode($_SERVER['REQUEST_URI']), PHP_URL_PATH);
$requested_file = basename($requested_uri);
$source_file = $document_root . $requested_uri;
if (!is_mobile()) {
$is_mobile = "FALSE";
} else {
$is_mobile = "TRUE";
}
$im = ImageCreateTrueColor(800, 300);
$text_color = ImageColorAllocate($im, 233, 14, 91);
$message_color = ImageColorAllocate($im, 91, 112, 233);
ImageString($im, 5, 5, 5, "Adaptive Images encountered a problem:", $text_color);
ImageString($im, 3, 5, 25, $message, $message_color);
ImageString($im, 5, 5, 85, "Potentially useful information:", $text_color);
ImageString($im, 3, 5, 105, "DOCUMENT ROOT IS: $document_root", $text_color);
ImageString($im, 3, 5, 125, "REQUESTED URI WAS: $requested_uri", $text_color);
ImageString($im, 3, 5, 145, "REQUESTED FILE WAS: $requested_file", $text_color);
ImageString($im, 3, 5, 165, "SOURCE FILE IS: $source_file", $text_color);
ImageString($im, 3, 5, 185, "DEVICE IS MOBILE? $is_mobile", $text_color);
//ImageString($im, 3, 5, 205, "Resolution: $resolution", $text_color); // Doesn't work
header("Cache-Control: no-store");
header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 1000) . ' GMT');
header('Content-Type: image/jpeg');
ImageJpeg($im);
ImageDestroy($im);
exit();
}
/* sharpen images function */
function findSharp($intOrig, $intFinal)
{
$intFinal = $intFinal * (750.0 / $intOrig);
$intA = 52;
$intB = -0.27810650887573124;
$intC = .00047337278106508946;
$intRes = $intA + $intB * $intFinal + $intC * $intFinal * $intFinal;
return max(round($intRes), 0);
}
/* refreshes the cached image if it's outdated */
function refreshCache($source_file, $cache_file, $resolution)
{
if (file_exists($cache_file)) {
// not modified
if (filemtime($cache_file) >= filemtime($source_file)) {
return $cache_file;
}
// modified, clear it
unlink($cache_file);
}
return generateImage($source_file, $cache_file, $resolution);
}
/* generates the given cache file for the given source file with the given resolution */
function generateImage($source_file, $cache_file, $resolution)
{
global $sharpen, $jpg_quality;
$extension = strtolower(pathinfo($source_file, PATHINFO_EXTENSION));
// Check the image dimensions
$dimensions = getimagesize($source_file);
$width = $dimensions[0];
$height = $dimensions[1];
//sendErrorImage($width . ' ' . $resolution);
// Do we need to downscale the image?
if ($width <= $resolution) { // no, because the width of the source image is already less than the client width
return $source_file;
}
// We need to resize the source image to the width of the resolution breakpoint we're working with
$ratio = $height / $width;
$new_width = $resolution;
$new_height = ceil($new_width * $ratio);
$dst = ImageCreateTrueColor($new_width, $new_height); // re-sized image
switch ($extension) {
case 'png':
$src = @imagecreatefrompng($source_file); // original image
break;
case 'gif':
$src = @imagecreatefromgif($source_file); // original image
break;
default:
//imagecreatefromstring(file_get_contents($source_file));
$src = @imagecreatefromjpeg($source_file); // original image
ImageInterlace($dst, true); // Enable interlancing (progressive JPG, smaller size file)
break;
}
if ($extension == 'png') {
imagealphablending($dst, false);
imagesavealpha($dst, true);
$transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);
imagefilledrectangle($dst, 0, 0, $new_width, $new_height, $transparent);
}
ImageCopyResampled($dst, $src, 0, 0, 0, 0, $new_width, $new_height, $width, $height); // do the resize in memory
ImageDestroy($src);
// sharpen the image?
// NOTE: requires PHP compiled with the bundled version of GD (see http://php.net/manual/en/function.imageconvolution.php)
if ($sharpen == TRUE && function_exists('imageconvolution')) {
$intSharpness = findSharp($width, $new_width);
$arrMatrix = array(
array(-1, -2, -1),
array(-2, $intSharpness + 12, -2),
array(-1, -2, -1)
);
imageconvolution($dst, $arrMatrix, $intSharpness, 0);
}
$cache_dir = dirname($cache_file);
//sendErrorImage($cache_dir);
// does the directory exist already?
if (!is_dir($cache_dir)) {
if (!mkdir($cache_dir, 0755, true)) {
// check again if it really doesn't exist to protect against race conditions
if (!is_dir($cache_dir)) {
// uh-oh, failed to make that directory
ImageDestroy($dst);
sendErrorImage("Failed to create cache directory: $cache_dir");
}
}
}
if (!is_writable($cache_dir)) {
sendErrorImage("The cache directory is not writable: $cache_dir");
}
// save the new file in the appropriate path, and send a version to the browser
switch ($extension) {
case 'png':
$gotSaved = ImagePng($dst, $cache_file);
break;
case 'gif':
$gotSaved = ImageGif($dst, $cache_file);
break;
default:
$gotSaved = ImageJpeg($dst, $cache_file, $jpg_quality);
break;
}
ImageDestroy($dst);
if (!$gotSaved && !file_exists($cache_file)) {
sendErrorImage("Failed to create image: $cache_file");
}
return $cache_file;
}
//sendErrorImage($source_file);
// check if the file exists at all
if(pathinfo($requested_file, PATHINFO_EXTENSION) != 'php')
{
if (!file_exists($source_file)) {
//sendErrorImage('404 ' . $source_file);
header("Status: 404 Not Found");
exit();
}
}
else if(pathinfo($requested_file, PATHINFO_EXTENSION) == php)
{
}
/* check that PHP has the GD library available to use for image re-sizing */
if (!extension_loaded('gd')) { // it's not loaded
if (!function_exists('dl') || !dl('gd.so')) { // and we can't load it either
// no GD available, so deliver the image straight up
trigger_error('You must enable the GD extension to make use of Adaptive Images', E_USER_WARNING);
sendImage($source_file, $browser_cache);
}
}
/* Check to see if a valid cookie exists */
if (isset($_COOKIE['resolution'])) {
$cookie_value = $_COOKIE['resolution'];
// does the cookie look valid? [whole number, comma, potential floating number]
if (!preg_match("/^[0-9]+[,]*[0-9\.]+$/", "$cookie_value")) { // no it doesn't look valid
setcookie("resolution", "$cookie_value", time() - 100); // delete the mangled cookie
} else { // the cookie is valid, do stuff with it
$cookie_data = explode(",", $_COOKIE['resolution']);
$client_width = (int)$cookie_data[0]; // the base resolution (CSS pixels)
$total_width = $client_width;
$pixel_density = 1; // set a default, used for non-retina style JS snippet
if (@$cookie_data[1]) { // the device's pixel density factor (physical pixels per CSS pixel)
$pixel_density = $cookie_data[1];
}
rsort($resolutions); // make sure the supplied break-points are in reverse size order
$resolution = $resolutions[0]; // by default use the largest supported break-point
// if pixel density is not 1, then we need to be smart about adapting and fitting into the defined breakpoints
if ($pixel_density != 1) {
$total_width = $client_width * $pixel_density; // required physical pixel width of the image
// the required image width is bigger than any existing value in $resolutions
if ($total_width > $resolutions[0]) {
// firstly, fit the CSS size into a break point ignoring the multiplier
foreach ($resolutions as $break_point) { // filter down
if ($total_width <= $break_point) {
$resolution = $break_point;
}
}
// now apply the multiplier
$resolution = $resolution * $pixel_density;
} // the required image fits into the existing breakpoints in $resolutions
else {
foreach ($resolutions as $break_point) { // filter down
if ($total_width <= $break_point) {
$resolution = $break_point;
}
}
}
} else { // pixel density is 1, just fit it into one of the breakpoints
foreach ($resolutions as $break_point) { // filter down
if ($total_width <= $break_point) {
$resolution = $break_point;
}
}
//sendErrorImage($client_width . " " . $resolution . " " . $pixel_density . " | " . $total_width);
}
}
}
/* No resolution was found (no cookie or invalid cookie) */
if (!$resolution) {
// We send the lowest resolution for mobile-first approach, and highest otherwise
$resolution = $is_mobile ? min($resolutions) : max($resolutions);
}
/* if the requested URL starts with a slash, remove the slash */
if (substr($requested_uri, 0, 1) == "/") {
$requested_uri = substr($requested_uri, 1);
}
/* whew might the cache file be? */
if(pathinfo($requested_file, PATHINFO_EXTENSION) == 'php')
{
$getstring = '';
foreach($_GET as $key => $item)
{
$getstring .= $key . '~' . $item . '^';
}
$fileinfophp = pathinfo($_SERVER['REQUEST_URI']);
//sendErrorImage($getstring);
$cache_file = $document_root . "/$cache_path/$resolution/" . 'php/' . $fileinfophp['filename'] . '%' . $getstring;
}
else
$cache_file = $document_root . "/$cache_path/$resolution/" . $requested_uri;
/* Use the resolution value as a path variable and check to see if an image of the same name exists at that path */
if (file_exists($cache_file)) { // it exists cached at that size
if ($watch_cache) { // if cache watching is enabled, compare cache and source modified dates to ensure the cache isn't stale
$cache_file = refreshCache($source_file, $cache_file, $resolution);
}
sendImage($cache_file, $browser_cache);
}
//sendErrorImage('gen');
/* It exists as a source file, and it doesn't exist cached - lets make one: */
$file = generateImage($source_file, $cache_file, $resolution);
//file_put_contents('image.jpg', $file);
sendImage($file, $browser_cache);