[Sho Ke]

That's a ternary operator.
Taken from the link above:

// Example usage for: Ternary Operator
$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];

// The above is identical to this if/else statement
if (empty($_POST['action'])) {
    $action = 'default';
} else {
    $action = $_POST['action'];
}

[andrewsw]

'?:' is the ternary operator - the docs. Basically, a shorthand for if..else:

if (is_int($num1)) {
    echo "true";
} else {
    echo 0;
}

[brerallia]

so now i understand!!!! thank you so much for helping me with this thing.. i now understood... i hope God will be bless you always... again thank you so much.... i wish i could be like you... a true programmer...!! />

This post has been edited by Dormilich: 01 February 2013 - 02:30 AM
Reason for edit:: removed quote

[brerallia]

and one more thing i really need to know about..
how to display the value of a variable with a data type null??
it doesnt displays on the browser... />

example:

$num3 = null;
<?php echo $num3; ?>

it doesnt display the null value..

This post has been edited by Dormilich: 01 February 2013 - 02:30 AM
Reason for edit:: removed quote

[CTphpnwb]

Null is computer speak for no value, so it can't be displayed. You could do something like:

if($x === null) { echo "null";}

This post has been edited by Dormilich: 02 February 2013 - 04:34 AM
Reason for edit:: made the comparison for NULL exclusively

[brerallia]

To all:

Thank you for helping me with this thing.. i am a beginner in php and i appreciate all of your help. thank you so much...!!!

To those who help me, dont worry... i will all give you a post up each one... all of you deserve it!!!