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<?php |
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namespace Helick\GTM; |
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use Helick\GTM\Contracts\Bootable; |
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final class Snippet implements Bootable |
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{ |
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/** |
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* Boot the service. |
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* |
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* @return void |
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*/ |
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public static function boot(): void |
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{ |
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$self = new static; |
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add_action('wp_head', [$self, 'head'], 1, 0); |
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add_action('wp_body_open', [$self, 'body'], 1, 0); |
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} |
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/** |
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* Display the head snippet. |
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* |
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* @return void |
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*/ |
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public function head(): void |
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{ |
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$this->displayDataLayer(); |
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$this->displayHeadSnippet(); |
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} |
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/** |
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* Display the body snippet. |
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* |
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* @return void |
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*/ |
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public function body(): void |
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{ |
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$snippet = <<<HTML |
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<!-- Google Tag Manager (noscript) --> |
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<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=%s" |
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height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript> |
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<!-- End Google Tag Manager (noscript) --> |
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HTML; |
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$containerId = containerId(); |
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echo sprintf($snippet, esc_js($containerId)), "\n"; |
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} |
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/** |
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* Display the data layer. |
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* |
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* @return void |
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*/ |
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private function displayDataLayer(): void |
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{ |
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$snippet = '<script>%s=[%s]</script>'; |
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$dataLayerVariable = dataLayerVariable(); |
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$dataLayer = dataLayer(); |
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if (empty($dataLayer)) { |
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return; |
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} |
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echo sprintf( |
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$snippet, |
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esc_js($dataLayerVariable), |
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wp_json_encode($dataLayer) |
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), "\n"; |
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} |
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/** |
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* Display the head snippet. |
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* |
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* @return void |
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*/ |
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private function displayHeadSnippet(): void |
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{ |
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$snippet = <<<HTML |
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<!-- Google Tag Manager --> |
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<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': |
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new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], |
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j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= |
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'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); |
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})(window,document,'script','%s','%s');</script> |
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<!-- End Google Tag Manager --> |
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HTML; |
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$dataLayerVariable = dataLayerVariable(); |
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$containerId = containerId(); |
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echo sprintf( |
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$snippet, |
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esc_js($dataLayerVariable), |
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esc_js($containerId) |
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), "\n"; |
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} |
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} |
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helick /
gtm
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