Calling php function using button onclick

I am using the following html button <button onclick=”ga_cal_change_status(2300)”/> and I want to call the “my_message” php function from onclick event ga_cal_change_status(2300) passing the value 2300. I am using the following code in functions.php file <?php add_action(‘wp_footer’, ‘ga_php_cal_change_status’); if( ! function_exists( ‘ga_php_cal_change_status’ ) ){ function ga_php_cal_change_status($entry_id){ ?> <script> function ga_cal_change_status($entry_id){ console.log(“ga_php_cal_change_status %d”, $entry_id); /* how…

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