// Add Google Tag code which is supposed to be placed after opening body tag.
add_action( 'wp_body_open', 'wpdoc_add_custom_body_open_code' );
function wpdoc_add_custom_body_open_code() {
echo '<!-- Google Tag Manager (noscript) --><noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-J4LMVLR" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript><!-- End Google Tag Manager (noscript) -->';
}
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Backward Compatibility
A conditional check can make it compatible with older WordPress versions.
Expand full source codeCollapse full source code
For More Information: https://make.wordpress.org/themes/2019/03/29/addition-of-new-wp_body_open-hook/
Basic usage:
For more information read this post: https://generatewp.com/wordpress-5-2-action-that-every-theme-should-use/