Using javascript define a fucntion:

function copy(url) {
var inputing_var = document.createElement(“input”);
inputing_var.setAttribute(“value”, url);
document.body.appendChild(inputing_var);
inputing_var.select();
document.execCommand(“copy”);
document.body.removeChild(inputing_var);
}

 

Use below code to create buttons:

<?php $copylinks=”Hello”; ?>

<button onclick=”copy(‘<?php echo $copylinks; ?>’);”>Copylink</button>