Add lazy load

css-minifier.php

@@ -0,0 +1,106 @@
+<?php
+/**
+ * CSS Minifier Function
+ * 
+ * A standalone PHP function to minify CSS content by:
+ * - Removing comments
+ * - Removing whitespace and line breaks
+ * - Removing unnecessary semicolons
+ * - Optimizing colors
+ * - Shortening zero values
+ * 
+ * @author WPA Superstar Plugin
+ * @version 1.0.0
+ */
+
+/**
+ * Minifies CSS content
+ * 
+ * @param string $css The CSS content to minify
+ * @return string The minified CSS content
+ */
+function minify_css($css) {
+    if (empty($css)) {
+        return $css;
+    }
+    
+    try {
+        // Remove comments
+        $css = preg_replace('/\/\*[\s\S]*?\*\//', '', $css);
+        
+        // Remove whitespace around key characters
+        $css = preg_replace('/\s*([{}:;,])\s*/', '$1', $css);
+        
+        // Remove newlines, tabs, and extra spaces
+        $css = preg_replace('/\s+/', ' ', $css);
+        
+        // Remove unnecessary semicolons
+        $css = str_replace(';}', '}', $css);
+        
+        // Convert rgb to hex where shorter
+        $css = preg_replace_callback(
+            '/rgb\s*\(\s*([0-9]+)\s*,\s*([0-9]+)\s*,\s*([0-9]+)\s*\)/i',
+            function($matches) {
+                $r = intval($matches[1]);
+                $g = intval($matches[2]);
+                $b = intval($matches[3]);
+                
+                // Only convert if the hex representation would be shorter
+                if ($r < 256 && $g < 256 && $b < 256) {
+                    $hex = sprintf("#%02x%02x%02x", $r, $g, $b);
+                    // Check if it can be shortened to #XXX format
+                    if (preg_match('/#([0-9a-f])\1([0-9a-f])\2([0-9a-f])\3/i', $hex)) {
+                        $hex = preg_replace('/#([0-9a-f])\1([0-9a-f])\2([0-9a-f])\3/i', '#$1$2$3', $hex);
+                    }
+                    return $hex;
+                }
+                return $matches[0];
+            },
+            $css
+        );
+        
+        // Optimize zero values (remove units)
+        $css = preg_replace('/([:\s])0(?:px|pt|em|rem|%|in|cm|mm|pc|ex|vw|vh|vmin|vmax)/', '$10', $css);
+        
+        // Shorten multiple zeros
+        $css = preg_replace('/\b0 0 0 0\b/', '0', $css);
+        $css = preg_replace('/\b0 0 0\b/', '0', $css);
+        $css = preg_replace('/\b0 0\b/', '0', $css);
+        
+        // Shorten colors where possible (e.g., #ffffff to #fff)
+        $css = preg_replace('/#([0-9a-f])\1([0-9a-f])\2([0-9a-f])\3/i', '#$1$2$3', $css);
+        
+    } catch (Exception $e) {
+        // If any error occurs, return original CSS
+        return $css;
+    }
+    
+    return trim($css);
+}
+
+// Example usage
+// -----------------
+// Input CSS:
+//   .example {
+//       color: #ffffff;
+//       margin: 0px 0px 0px 0px;
+//       padding: 20px;
+//       background-color: rgb(51, 51, 51);
+//   }
+//
+// Output (minified):
+//   .example{color:#fff;margin:0;padding:20px;background-color:#333}
+
+// Simple test case
+if (basename(__FILE__) == basename($_SERVER['SCRIPT_FILENAME'])) {
+    $test_css = '
+    .example {
+        color: #ffffff;
+        margin: 0px 0px 0px 0px;
+        padding: 20px;
+        background-color: rgb(51, 51, 51);
+    }';
+    
+    echo "Original:\n" . $test_css . "\n\n";
+    echo "Minified:\n" . minify_css($test_css);
+}