About User Form?

[Anon]

Please help me.
I have a user input, to validate this when the user click the submit button, i presented the user on other php page what the fields he inputted. Would you please help me to change this style to this: when the user clicks the submit button, it will stay on the same page with a user validation which is marked by red as the wrong field to know the user what will he gonna be corrected..
Thanks ...

[Anon]

<?php
// Form validation
if (strlen($Username) < 8){ $Error .= "<li>Username must be at least 8 characters long"; }
if (!checkdate($Date)){ $Error .= "<li>Date field has an incorrect value"; }

if (!empty($Error))
{
print ("<font color=#FF0000>Errors found\n<ul>$Error</ul>\n");
} else {
// INSERT into database
}
?>

<form>
</form>

[Anon]

The code is a little weird, because HTML tags are accepted... trying it on another way ;-)

&lt;?php
// Form validation
if (strlen($Username) &lt; 8){ $Error .= "&lt;li&gt;Username must be at least 8 characters long"; }
if (!checkdate($Date)){ $Error .= "&lt;li&gt;Date field has an incorrect value"; }

if (!empty($Error))
{
print ("&lt;font color=#FF0000&gt;Errors found\n&lt;ul&gt;$Error&lt;/ul&gt;\n");
} else {
// INSERT into database
}
?&gt;

&lt;form&gt;
&lt;/form&gt;