Function to minify your page on the fly using php

minify_page.php

    /** To use minify with ob_start just put at the top of your page
     * Warning:
     * - This function still not support to remove any comments in javascript
     * - Minifying on buffering will take so much memory and it not recomended for high traffic
     */
    function sanitize_output($buffer) {
    
        $search = array(
            // Minify HTML
            '/\>[^\S ]+/s',                                 // strip whitespaces after tags, except space [^1]
            '/[^\S ]+\</s',                                 // strip whitespaces before tags, except space [^2]
            '/<!--(.|\s)*?-->/',                            // Remove HTML comments [^3]
            // Minify Javascript
            '#\s*([!%&*\(\)\-=+\[\]\{|;:,.<>?\/])\s*#',     // Remove white-space(s) around punctuation(s) [^4]
            '#[;,]([\]\}])#',                               // Remove the last semi-colon and comma [^5]
            '#\btrue\b#', '#false\b#', '#return\s+#',       // Replace `true` with `!0` and `false` with `!1` [^6]
            '/\}[^\S ]+/s',                                 // strip whitespaces after tags }, except space [^7]
            '/[^\S ]+\}/s'                                  // strip whitespaces before tags }, except space [^8]
        );
    
        $replace = array(
            '>',                    // [^1]
            '<',                    // [^2]
            '',                     // [^3]
            '$1',                   // [^4]
            '$1',                   // [^5]
            '!0', '!1', 'return ',  // [^6]
            '}',                    // [^7]
            '}'                     // [^8]
        );
    
        $buffer = preg_replace($search, $replace, $buffer);
    
        return $buffer;
    }
              
    ob_start("sanitize_output");