You may use:
<?php
$disabledString = "";
if ($_SESSION['sess_user']){
$disabledString = "";
}else{
$disabledString = 'disabled="disabled"';
}
?>
<input type="submit" name="submit" value="Comment" <?= $disabledString ?> />
This will either print (button disable) in browser:
<input type="submit" name="submit" value="Comment" disabled="disabled" />
Or (not enabled):
<input type="submit" name="submit" value="Comment" />
1
solved Prevent button press without login [closed]