When you submit the form the process then handed to processCategory.php.
All kind of category processing ( add, modify, delete ) are done in this file.
On top of the script there's a simple switch to call the appropriate function
based on the action required.
$action = isset($_GET['action']) ? $_GET['action'] : '';
switch ($action) {
case 'addCategory' :
addCategory();
break;
case 'modifyCategory' :
modifyCategory();
break;
case 'deleteCategory' :
deleteCategory();
break;
case 'deleteImage' :
deleteImage();
break;
default :
// if action is not defined or unknown
// move to main category page
header('Location: index.php');
}
On the add category form the form action is set as processCategory.php?action=addCategory
so if you look at the code above the script will call addCategory();.
If no action is defined we just redirect to category main page.
When saving the product image there is a possibility of name conflict. It
may seem weird for two categories to have the same image name, but in some
cases it can happen. To avoid such conflict we will generate a new name for
each category image we upload using the combination of rand(),
time() and md5()
functions like this :
// get the image extension
$ext = substr(strrchr($image['name'], "."), 1);
// generate a random new file name to avoid name conflict
$imagePath = md5(rand() * time()) . ".$ext";
The image name wil then become something like 6c444ed816ce251d610c25154dc28462.jpg.
Now it's almost impossible for us to ever hit the name conflict
problem. We will use the same name generation for the product image and thumbnail.
How does it work ?
The time() function will return the number
of seconds elapsed since the beginning of ( computer ) time which is January
1, 1970. Using rand() function we get a random
value less or equal to the number of seconds. We need to use rand()
because this shopping cart can have more than one admin. If two admins
happen to submit the form at the same second the result of
time() will be the same.
As the final step md5() use the random value
and return the hash ( a string with 32 characters ). If you feel that using
32 characters for a filename is too much you can use substr()
function to cut it like this :
// get the image extension
$ext = substr(strrchr($image['name'], "."), 1);
// generate a random new file name to avoid name conflict
$imagePath = substr(md5(rand() * time()), 0, 10) . ".$ext";
The code above will use only the first ten characters as the file name.
Next is the modify category page.
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