please explain this php code

[ianhg]

Hi
Can someone please explain to me what is happening here with this code:
<?php echo (isset($sInfo->products_name)) ? $sInfo->products_name . ' <small>(' . $currencies->format($sInfo->products_price) . ')</small>' : zen_draw_products_pull_down('products_id', 'size="5" style="font-size:10px"', $customprice_array, true, $_GET['add_products_id'], true); echo zen_draw_hidden_field('products_price', (isset($sInfo->products_price) ? $sInfo->products_price : '')); ?>

Thanks
Ian

[gjh42]

This code uses two instances of a compact form of "if/then/else" test.

The general form is

[php code which can be true or false] ? [code to be executed if true] : [code to be executed if false] ;

I'll leave you the exercise of deciphering it given the form.

[gjh42]

The second part of this looks incorrectly written.

echo zen_draw_hidden_field('products_price', (isset($sInfo->products_price) ? $sInfo->products_price : ''));

? $sInfo->products_price : ''));

should be

? $sInfo->products_price)) : ''));

so that both close parentheses are output in either case.

[ianhg]

Thanks for the help.
'zen_draw_products_pull_down ' I understand that this produces a box but is this set somewhere else in files? Hope I have explained what I mean --
Have a Happy, Healthy and Prosperous New Year

[gjh42]

Anything like that which is followed by parentheses () is a function, which will probably be in one of the /includes/functions/ folders.

Search in Tools > Developers Toolkit for zen_draw_products_pull_down and you will find the file where it is created.

[DrByte]

The second part of this looks incorrectly written.

echo zen_draw_hidden_field('products_price', (isset($sInfo->products_price) ? $sInfo->products_price : ''));

? $sInfo->products_price : ''));

should be

? $sInfo->products_price)) : ''));

so that both close parentheses are output in either case.

I'm not sure I agree. The parenthesis in the original post are correct.

[DrByte]

Hi
Can someone please explain to me what is happening here with this code:
<?php echo (isset($sInfo->products_name)) ? $sInfo->products_name . ' <small>(' . $currencies->format($sInfo->products_price) . ')</small>' : zen_draw_products_pull_down('products_id', 'size="5" style="font-size:10px"', $customprice_array, true, $_GET['add_products_id'], true); echo zen_draw_hidden_field('products_price', (isset($sInfo->products_price) ? $sInfo->products_price : '')); ?>

In english:
If the product name is known, display it, followed by its price in small font.
Otherwise, draw a pulldown menu containing a list of products, excluding the products in $customprice_array, defaulting to the selected add_products_id from the browser URL, and the display is to include the product ID and model number.
Then it draws a hidden field for products_price using the product price if known, or blank if not known.
That's the way it works in the admin. If it was used in the storefront, there would be fewer parameters used.

As gjh42 said, locate the function and you can study what each of the parameters do if you're trying to customize it somehow.

[gjh42]

If it's part of ZC core, I would expect it to be correct... What I know of that form comes from looking at ZC code. I've never been able to find mention of it in books or online resources (that would probably be easier if I knew what to call it.)

So does the
? $sInfo->products_price : ''));
end its alternate output at the first parenthesis? It must be so, unless it's ok for the
zen_draw_hidden_field('products_price', (
to never close.

What is the rule for ending the alternate? Or better yet, what is this form called, so I can look it up and learn more about it?

[DrByte]

What I know of that form comes from looking at ZC code. I've never been able to find mention of it in books or online resources (that would probably be easier if I knew what to call it.)

So does the
? $sInfo->products_price : ''));
end its alternate output at the first parenthesis? It must be so, unless it's ok for the
zen_draw_hidden_field('products_price', (
to never close.

What is the rule for ending the alternate? Or better yet, what is this form called, so I can look it up and learn more about it?

That's the syntax of the "Ternary Operator" comparison/condition expressions.
http://www.php.net/manual/en/language.expressions.php
http://www.php.net/manual/en/languag...comparison.php

[gjh42]

So the parenthesis has a higher precedence than the ternary operator, and will close it out (or limit the beginning) if appropriate. Actually, I think I've used it that way, but didn't remember that when looking at the code above...

Thanks, DrByte!