Validate String

Is there anyway i can validate and know that there is numbers within a string ???

$temp = "abc123";

And also for email validation, how can i know that within the string, "@" and "." exist ???

yes..
you will need some regex though, and Im not too great with them..

could be something as simple as

<?
$string = "abc123";
if(ereg('[0-9]', $string)
{
   //does not contain numbers?
}
else
{
  //does contain numbers?
}

?>

2)
do a search on these boards for
email verification

what bout converting all the character in the string to Upper case ?? any function i can use ???