[SOLVED] Shorthand PHP??

[tqla]

I am working on a script that has lines like this:

<iframe src="script.php?card_id=<?=$_GET['card_id']?><?=isset($_GET['prv'])?'&prv='.$_GET['prv']:''?>" width="638" height="848" scrolling="no" frameborder="0"></iframe>

 

My goal is to get it out of an iFrame and just use includes but I have never seen this before:

<?=isset()

 

Is this some kind of php shorthand? What does it mean? Thanks.

 

 

 

[the182guy]

<?=$some_variable?> is the same as <?php echo $some_variable; ?>

 

In PHP you can use the short open tag, as long as it is set to be allowed in your php.ini

 

short_open_tag 1/0

 

You can start a script with <? instead of<?php

 

Most people use the long open tag though because it makes their scripts more portable. Also <? is used in other programming languages, if any of those installed on the server, it will try and guess which programming language to use so could end up with problems.

 

The script you have also uses what's known as the ternary operator.

 

This code in your script:

<?=isset($_GET['prv'])?'&prv='.$_GET['prv']:''?>

Is the same as doing:

<?php

if(isset($_GET['prv']))
{
    echo '&prv=';
}
else
{
    echo '';
}

?>

[tqla]

Thanks the182guy.

 

So is this?

 

<?=isset($_GET['var'])?>

 

The same as?

 

<?php if(isset($_GET['var'] ?>

 

Or is it the same as?

 

<?php echo if(isset($_GET['var'] ?>

[Ken2k7]

No, it's the same as <?php echo isset($_GET['var']); ?>

[tqla]

THANKS!

[the182guy]

I have just editted my first post.........

 

When you do the short open tag with the equals sign after it like this

 

<?=$hello_world?>

 

It echos whatever is between the = and the final ?

 

isset() returns true or false, so if you were to do <?=isset($_GET['var'])?> then it would echo 0 or 1 on the page.

[tqla]

Great explanation the182guy. I fully understand. Thanks.