最後在網路上...看到解決方式了^^
<?php $sub_content=$row_fadata['issue']; ?>
<?php if(!function_exists('str_ireplace')) {
function str_ireplace($search,$replace,$subject) {
$search = preg_quote($search, "/");
return preg_replace("/".$search."/i", $replace, $subject);
}
}
$sub_content=str_ireplace($_GET['issue'],"<b><font color=\"#FF0000\">".$_GET['issue']."</font></b>",$sub_content);?>
<?php echo $sub_content;?> </div>