One can now add a HTTP header for Cache-Control in the config file, #109.

CImage.php

@@ -63,6 +63,13 @@ class CImage
 
 
 
+    /**
+     * Add HTTP headers for outputing image.
+     */
+    private $HTTPHeader = array();
+
+
+
     /**
      * Default background color, red, green, blue, alpha.
      *
@@ -2422,11 +2429,28 @@ class CImage
 
 
 
+    /**
+     * Add HTTP header for putputting together with image.
+     *
+     * @param string $type  the header type such as "Cache-Control"
+     * @param string $value the value to use
+     *
+     * @return void
+     */
+    public function addHTTPHeader($type, $value)
+    {
+        $this->HTTPHeader[$type] = $value;
+    }
+
+
+
     /**
      * Output image to browser using caching.
      *
-     * @param string $file   to read and output, default is to use $this->cacheFileName
-     * @param string $format set to json to output file as json object with details
+     * @param string $file   to read and output, default is to
+     *                       use $this->cacheFileName
+     * @param string $format set to json to output file as json
+     *                       object with details
      *
      * @return void
      */
@@ -2463,6 +2487,10 @@ class CImage
             header('Last-Modified: ' . $gmdate . " GMT");
         }
 
+        foreach($this->HTTPHeader as $key => $val) {
+            header("$key: $val");
+        }
+
         if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $lastModified) {
 
             if ($this->verbose) {

REVISION.md

@@ -8,6 +8,7 @@ Revision history
 v0.7.6* (2015-10-20)
 -------------------------------------
 
+* One can now add a HTTP header for Cache-Control in the config file, #109.
 * Added hook in img,php before CImage is called, #123.
 * Added configuration for default jpeg quality and png compression in the config file, #107. 
 * Strip comments and whitespace in imgs.php, #115.

webroot/img.php

@@ -928,6 +928,18 @@ $cachePath = getConfig('cache_path', __DIR__ . '/../cache/');
 
 
 
+/**
+ * Get the cachepath from config.
+ */
+$cacheControl = getConfig('cache_control', null);
+
+if ($cacheControl) {
+    verbose("cacheControl = $cacheControl");
+    $img->addHTTPHeader("Cache-Control", $cacheControl);
+}
+
+
+
 /**
  * Prepare a dummy image and use it as source image.
  */

webroot/img_config.php

@@ -140,6 +140,16 @@ return array(
 
 
 
+       /**
+        * Add header for cache control when outputting images.
+        *
+        * Default value:
+        *  cache_control: null, or set to string
+        */
+        //'cache_control' => "max-age=86400",
+
+
+
      /**
       * The name representing a dummy image which is automatically created
       * and stored at the defined path. The dummy image can then be used