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<?php |
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include('lib/dom-parser.php'); |
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|
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function flying_scripts_is_keyword_included($content, $keywords) |
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{ |
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foreach ($keywords as $keyword) { |
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if (strpos($content, $keyword) !== false) { |
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return true; |
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} |
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} |
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return false; |
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} |
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|
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function flying_scripts_rewrite_html($html) |
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{ |
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try { |
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// Detect non-HTML |
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if (!isset($html) || trim($html) === '' || strcasecmp(substr($html, 0, 5), '<?xml') === 0 || trim($html)[0] !== "<") { |
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return $html; |
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} |
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|
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// Parse HTML |
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$newHtml = str_get_html($html); |
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|
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// Not HTML, return original |
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if (!is_object($newHtml)) { |
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return $html; |
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} |
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|
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$include_list = get_option('flying_scripts_include_list'); |
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|
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foreach ($newHtml->find("script[!type],script[type='text/javascript']") as $script) { |
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if (flying_scripts_is_keyword_included($script->outertext, $include_list)) { |
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$script->setAttribute("data-type", "lazy"); |
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if ($script->getAttribute("src")) { |
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$script->setAttribute("data-src", $script->getAttribute("src")); |
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$script->removeAttribute("src"); |
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} else { |
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$script->setAttribute("data-src", "data:text/javascript;base64,".base64_encode($script->innertext)); |
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$script->innertext=""; |
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} |
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} |
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} |
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|
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return $newHtml; |
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} catch (Exception $e) { |
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return $html; |
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} |
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} |
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|
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if (!is_admin()) { |
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ob_start("flying_scripts_rewrite_html"); |
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} |
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|
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// W3TC HTML rewrite |
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add_filter('w3tc_process_content', function ($buffer) { |
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if ( is_admin() ) return $buffer; |
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return flying_scripts_rewrite_html($buffer); |
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}); |
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|
