如何在PHP中显示消息框[重复]

I am new to PHP. I have to display a message box asking if new record is required or we can copy and modify an old record to the user while adding a new record. How can I do this? Please help.

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I usually use this for messageboxes:

function alert($string)
{
    echo '<script type="text/javascript">alert("' . $string . '");</script>';
}

Not the cleanest method, but usually works without problems.