1.2.0

README.md

@@ -62,6 +62,12 @@ The generated output looks like this:
 
 Use it to make your website loading times even faster.
 
+## Automatic WebP generation for updated images (new in v1.2.0)
+
+ImgOpt will set the modification date of the generated WebP image to match the modification date of the original image file.
+
+If ImgOpt detects that a file modification date of the source image file is different than the date of the previously generated WebP image file - it will automatically re-create the new WebP image file!
+
 ## Installation
 
 The preferred way to install the library is through the [composer](https://getcomposer.org/).
@@ -166,7 +172,4 @@ And it will generate this HTML code:
 
 Hope you like it. For questions, bug & feature requests visit my site:
 
-Bartosz Wójcik | https://www.pelock.com
-
-
-
+Bartosz Wójcik | https://www.pelock.com

composer.json

@@ -1,6 +1,6 @@
 {
     "name": "pelock/yii2-imgopt",
-    "version": "1.1.2",
+    "version": "1.2.0",
     "description": "Image optimization widget for Yii2 Framework with auto WebP image format generation from PNG/JPG files.",
     "type": "yii2-extension",
     "keywords": ["image", "optimization", "yii2", "webp", "jpg", "png", "generator"],

src/ImgOpt.php

@@ -190,6 +190,9 @@ private function get_or_convert_to_webp($img, $recreate = false)
 			return null;
 		}
 
+		// modification time of the original image
+		$img_modification_time = filemtime($img_full_path);
+
 		$original_file_size = filesize($img_full_path);
 
 		if ($original_file_size === 0)
@@ -208,15 +211,29 @@ private function get_or_convert_to_webp($img, $recreate = false)
 		$webp_short_path = $short_file_info["dirname"] . "/" . $webp_filename_with_extension;
 		$webp_full_path = $file_info["dirname"]  . "/" . $webp_filename_with_extension;
 
-
+		// if the WEBP file already exists check if we want to re-create it
 		if ($recreate === false && file_exists($webp_full_path))
 		{
+
+			// if the WEBP file is bigger than the original image
+			// use the original image
 			if (filesize($webp_full_path) >= $original_file_size)
 			{
 				return null;
 			}
 
-			return $webp_short_path;
+			$webp_modification_time = filemtime($webp_full_path);
+
+			// if the modification dates on the original image
+			// and WEBP image are the same = use the WEBP image
+			// in any other case - recreate the file
+			if ($img_modification_time !== false && $webp_modification_time !== false)
+			{
+				if ($img_modification_time === $webp_modification_time)
+				{
+					return $webp_short_path;
+				}
+			}
 		}
 
 		if ($ext === "png")
@@ -253,6 +270,15 @@ private function get_or_convert_to_webp($img, $recreate = false)
 		// release input image
 		imagedestroy($img);
 
+
+		// set modification time on the WEBP file to match the
+		// modification time of the original image
+		if ($img_modification_time !== false)
+		{
+			touch($webp_full_path, $img_modification_time);
+		}
+
+
 		// if the final WEBP image is bigger than the original file
 		// don't use it (use the original only)
 		if (filesize($webp_full_path) >= $original_file_size)