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[SOLVED] PHP basic math question
Posted: Mon Mar 31, 2014 7:17 am
by Andaho
I have edited my tpl files to display this:
RRP:
£100.00 You Save: £0
Price: £90.00
I'm trying to get it to display how much is saved... I used this line:
Code: Select all
<span class="price-rrp"> You Save: £<?php echo $price - $special; ?></span>
Why is it not working?
Re: PHP basic math question
Posted: Mon Mar 31, 2014 11:36 am
by rph
Because the prices have the pound symbol in them. This is one of the areas in PHP where things can get tricky fast. Something like "£100.00" is a non-numeric string. That means PHP can't turn it into a number when doing math. But instead of throwing an error PHP silently converts the string to 0 and continues.
One solution is to strip all the non-numeric characters then do the math:
Code: Select all
<?php echo preg_replace('/[^0-9\.]/', '', $price) - preg_replace('/[^0-9\.]/', '', $special); ?>
This is a very "hacky" way to do the code. I'd recommend not using it if possible.
A better solution is doing the math in the controller file using the non-formatted prices then send the output to the template.
Re: PHP basic math question
Posted: Mon Mar 31, 2014 12:05 pm
by Cue4cheap
Re: PHP basic math question
Posted: Mon Mar 31, 2014 7:26 pm
by Andaho
Thanks guys, I don't know why I tried to do this myself without searching for a free extension for it first!
I'm going to try out this one:
http://www.opencart.com/index.php?route ... on_id=8319
Re: [SOLVED] PHP basic math question
Posted: Mon Mar 31, 2014 7:49 pm
by Andaho
I had already started butchering my php code, so I used code from that extension to add the following lines in the copied locations:
Code: Select all
$this->data['yousave'] = $this->currency->format($this->tax->calculate($product_info['price']-$product_info['special'], $product_info['tax_class_id'], $this->config->get('config_tax')));
$this->data['yousavepercent'] = round(($product_info['price']-$product_info['special'])*100/$product_info['price'],0);
$yousave = $this->currency->format($this->tax->calculate($result['price']-$result['special'], $result['tax_class_id'], $this->config->get('config_tax')));
$yousavepercent = round(($result['price']-$result['special'])*100/$result['price'],0);
Way too complicated for me to even start understanding! - but now in my product.tpl file, when I refer to $yousave I get what I want
- and I have the bonus of having % too
