WordPress AddToAny custom script to : push shared data to datalayer for GTM, re-shape title to remove special characters & use shortlink for Twitter

add2any_custom_js.php

<?php
/**
 * AddToAny : custom script inserted into the document head
 *
 * Push shared data to datalayer for GTM
 * Re-shape title to remove special characters
 * Use shortlink for Twitter
 *
 * see https://www.addtoany.com/ext/google_analytics/
 * see https://www.addtoany.com/buttons/customize/wordpress/events
 **/
add_action( 'wp_head', 'add2any_custom_js', 999 );
function add2any_custom_js(){
	global $post;
?>
	<script>
		// Init AddToAny objects
		var a2a_config=a2a_config||{};
		a2a_config.callbacks=a2a_config.callbacks||[];

		// GA events tracking
		a2a_config.callbacks.push({
			share: function(data) {
				// Track shares in Google Analytics with Google Tag Manager
				dataLayer.push({
					"event"        : "<?php _e( 'Share with AddToAny', 'text-domain' ) ?>", 
					"socialAction" : "<?php _e( 'Social share', 'text-domain' ) ?>", 
					"socialNetwork": data.service,
					"socialTarget" : data.url
				});

				// Shared data
<?php			if ( is_singular() ) { ?>
				// Corectly encoded title
				data.title = <?php
					$title = html_entity_decode( strip_tags( get_the_title( $post->ID ) ), ENT_QUOTES );
					$sanitized_title = function_exists( 'wp_json_encode' ) ? wp_json_encode ( $title ) : json_encode( $title );
					echo $sanitized_title;
					?>;
<?php			} ?>
				// Short url for Twitter share
				if ( 'Twitter' === data.service ) {
					data.url = "<?php echo wp_get_shortlink() ?>"
				}

				// Log data to console for debug purpose
				console.log( 'AddToAny shared object : ' + data );

				return data;
			}
		});
	</script>
<?php
}

?>