Alert box

Greetings all

I'm working on a registration form and I've got it done in Javascript. But since I'm going to be using it to input data to a MySql database, I think it's a better idea to write it in PHP. I like the alert boxes to tell users things like "Alert. At least one of the fields is empty." or "Alert. Passwords don't match." and things like that.

Below is part of the form in Javascript.

Is there a way to generate an alert box with PHP?

<html>

<head>
<title>Alert box</title>
</head>

<body>
<script type="text/javascript">

function check_fields()
{
var usr_name = document.getElementById('u_name')
var passwrd = document.getElementById('pass')
var reenter_passwrd = document.getElementById('reenter_pass')

if (usr_name.value.length==0 || passwrd.value.length==0 || reenter_passwrd.value.length==0)
{
alert("At least one field is empty.")
}
}

</script>

<form>

<input type="text" id="u_name">
<br>
<input type="password" id="pass">
<br>
<input type="password" id="reenter_pass">
<br>
<input type="Submit" value= "Submit" onClick="check_fields()"

</form>

</body>
</html>

Alert box

Displaying alert box with PHP

Adam5000

Matthew1980

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