March 2007 – Cameron Perry

Fixing Zen Cart’s Tax Miscalculation When Using a Coupon

I was recently alerted to an error in Zen Cart by a client where the tax was being miscalculated when using a coupon. Here’s the fix. Around line 240 in /store/includes/modules/order_total/ot_coupon.php Remove these lines: //$od_amount[$tax_desc] += (($products[$j][‘final_price’] * $products[$j][‘quantity’]) * $tax_rate)/100 * $ratio; //$od_amount[$tax_desc] += round(((($products[$j][‘final_price’] * $products[$j][‘quantity’]) * $tax_rate) + .5)/100 * $ratio, 2); …

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Clean file names using PHP preg_replace

It’s always a good idea to protect yourself from all sorts of possible malicious attempts by users (or even mistakes by misinformed users). Here we look at taking a string of text (a filename) containing characters that are generally speaking unsafe. Here’s a simple way to clean-up filenames (or other text input) using PHP – …

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