// Example 1$text = "onlyalphanumericcharacters012345";
if (ereg('[^A-Za-z0-9]', $text))
{
echo "This contains characters other than letters and numbers";}
else { echo "This contains only letters and numbers"; }
// Example 2$text = "mixedcharacters012345&../@";
if (ereg('[^A-Za-z0-9]', $text))
{ echo "This contains characters other than letters and numbers";}
else { echo "This contains only letters and numbers"; }
?>