What alternative methods can be used to include PHP content in a HTML file for client-side execution?

One alternative method to include PHP content in an HTML file for client-side execution is to use AJAX to make a request to a server-side PHP script that returns the desired content. This allows for dynamic content to be loaded onto the HTML page without having to reload the entire page. ```html <!DOCTYPE html> <html> <head> <title>Dynamic Content Example</title> </head> <body> <div id="dynamic-content"></div> <script> var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("dynamic-content").innerHTML = this.responseText; } }; xhttp.open("GET", "dynamic-content.php", true); xhttp.send(); </script> </body> </html> ```