how can I use isset values?

co_ador

Can you guys explain me what does this mean?

$cat = isset($_GET['subject']) &&
is_numeric($_GET['subject'])?$_GET['subject']:null;
$prod = isset($_GET['menu']) && is_numeric($_GET['menu'])?$_GET['menu']:null;
$menu_type = isset($_GET['menu_type']) && is_string($_GET['menu_type'])?$_GET['menu_type']:null

And how can I use this values, give me as much opinios as you can.

I want to know how can I use a value when is isset($GET, is_numeric($GET, $_GET and null.

one example would be

$class = !is_null($cat) && $cat==$row['id']?' class="selected"':''

Thank you..

bastien

i generally prefer empty to isset. It does the isset and isnull at the same time

 $class = ((!empty($cat)) & ($cat == $row['id'])) ? 'class="selected"'    :  ''  ;

an example for $GET might be

$var = (!empty($_GET['some_var'])) ? $_GET['some_var'] : '' ;
if (is_numeric($var)){
//do something with $var

}//end if

Though if you are really looking to validate a $GET / $POST item, then I would mix in ereg/preg_match regex to handle the data

co_ador

Before I ask you a couple of question about your explanation

I have notice this = something ? something : something

What the = ? : means what's the logic behind.

Now If I use empty here:

$class = ((!empty($cat)) & ($cat == $row['id'])) ? 'class="selected"' : '' ;

then i will have to change the function isset for empty in here as well?

$cat = empty($_GET['subject']) &&
is_numeric($_GET['subject'])?$_GET['subject']:null;
$prod = empty($_GET['menu']) && is_numeric($_GET['menu'])?$_GET['menu']:null;
$menu_type = empty($_GET['menu_type']) && is_string($_GET['menu_type'])?$_GET['menu_type']:null

What if is_numeric means? if the value of the variable is a number or a string?

how do you refer when it is an string?

and finally what would be the output for the example you gave me on $_GET

$var = (!empty($GET['some_var'])) ? $GET['some_var'] : '' ;
if (is_numeric($var)){
//do something with $var

Thank you bro

bradgrafelman

co.ador;10915242 wrote:
What the = ? : means what's the logic behind.

That'd be the ternary operator. It's basically a shortened from of an if/else statement.

bastien

you can read the manual to get more info on is_numeric()