how to create a function that will eliminate the view of values equal to zero. can I do it only with "IF". the php is conected with the database

What do you mean by 'eliminate the view of values'? You can use if statements to compare something to zero:

PHP Code:

if($foo == 0)
{
     //do something
} 


I'm really not sure what you're asking.

Let's say you want to show results that do not have 0 downloads from a file database?

PHP Code:

    $ObtainInfo = mysql_query("SELECT * FROM `MyFiles` WHERE `downloads` != '0' "); 


turn this into an array and output as needed.

Otherwise you can use if statements and check each result individually before outputting;

PHP Code:

    $ObtainInfo = mysql_query("SELECT * FROM `MyFiles`");
    $Info = mysql_fetch_array($ObtainInfo);

    if($Info['downloads'] != '0'){
        echo $Info['title'];
    } 


Of course you can adapt to be more than, less than etc using these techniques based on if you are more familiar with PHP or MySQL syntax's/