How To Print Value On Search() To Check Them

How can I print the values that search() recieve?

Because I need to check something... I've tried with echo and other like using js alerts but I cant get the values...

$criteria->compare('t.email',$this->email,true);
                $criteria->compare('t.telefono',$this->telefono,true);
....


echo "<script type='text/javascript'>
alert('".$f1."');
console.log('".$f1."');
</script>";
echo $f1;

$criteria->addBetweenCondition('t.field',$f1,$f2,'AND');

How can I print these to check them?

Thx!