<?php
 
$size = 123;
$fname = '/test/uploads';
 
// first method:
?>
<input type="image" src="images/file2.png"  class="btTxt submit"
	width="85" onclick="myfunc(<?= $size ?>, '<?= $fname ?>')"><b><?= $fname ?></b>
</tr>
 
<?php
 
 // second method
echo "<input type='image' src='images/file2.png' class='btTxt submit' width='85' data-size='$size' data-fname='$fname'><b>$fname</b>";
echo "</tr>";
 
// now you can read dataset:
?>
<script>
document.querySelectorAll('input[type=image]').forEach(input =>	input.addEventListener('click', function (e) {
	const { size, fname } = this.dataset;
}));
</script>