Verifique se inclui números php
if (preg_match('~[0-9]+~', $string)) {
echo 'string with numbers';
}
Realy Silly Shark
if (preg_match('~[0-9]+~', $string)) {
echo 'string with numbers';
}
if (preg_match('/[A-Za-z]/', $myString) && preg_match('/[0-9]/', $myString))
{
echo 'Contains at least one letter and one number';
}