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{ $status = Catalog::DeleteCategory($this->mActionedCategoryId); if ($status < 0) $this->mErrorMessage = 'Category not empty'; } // If editing category's products ... if ($this->mAction == 'edit_products') { header('Location: admin.php Page=Products&DepartmentID=' . $this->mDepartmentId . '&CategoryID=' . $this->mActionedCategoryId); exit; } $this->mAdminCategoriesTarget .= '&DepartmentID=' . $this->mDepartmentId; // Load the list of categories $this->mCategories = Catalog::GetDepartmentCategories($this->mDepartmentId); $this->mCategoriesCount = count($this->mCategories); } } > 3. Create a new template file named admin_products.tpl in the presentation/templates folder, and add the following code to it: {* admin_products.tpl *} {load_admin_products assign="admin_products"} <span class="admin_page_text"> Editing products for category: {$admin_products->mCategoryName} [ {strip} <a href="{$admin_products->mAdminCategoriesLink|prepare_link:"https"}"> back to categories ... </a> {/strip} ] </span> <br /><br /> {if $admin_products->mErrorMessage neq ""} <span class="admin_error_text"> {$admin_products->mErrorMessage}<br /><br /> </span> {/if} <form method="post"

RAND_load_file(const char *filename, long bytes); RAND_seed(const void *buf, int num);

action="{$admin_products->mAdminProductsTarget|prepare_link:"https"}"> {if $admin_products->mProductsCount eq 0} <strong>There are no products in this category!</strong><br /> {else} <table> <tr> <th>Name</th> <th>Description</th> <th>Price</th> <th>Discounted Price</th> <th> </th> </tr> {section name=cProducts loop=$admin_products->mProducts} {if $admin_products->mEditItem == $admin_products->mProducts[cProducts].product_id} <tr> <td> <input type="text" size="15" name="name" value="{$admin_products->mProducts[cProducts].name}" /> </td> <td> {strip} <textarea name="description" rows="3" cols="39"> {$admin_products->mProducts[cProducts].description} </textarea> {/strip} </td> <td> <input type="text" name="price" value="{$admin_products->mProducts[cProducts].price}" size="5" /> </td> <td> <input type="text" name="discounted_price" value="{$admin_products->mProducts[cProducts].discounted_price}" size="5" /> </td> <td align="right" width="180"> <input type="submit" name="submit_update_prod_{ $admin_products->mProducts[cProducts].product_id}" value="Update" /> <input type="submit" name="cancel" value="Cancel" /> <input type="submit" name="submit_select_prod_{ $admin_products->mProducts[cProducts].product_id}" value="Select" /> </td>

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The RAND_seed() function allows you to specify a buffer of any type and size for entropy, while RAND_load_file() allows you to specify a file that contains entropy. In recent years, /dev/random has become increasingly popular in *nix systems as a file that the kernel maintains with as much entropy gathered from the system as possible. So to read 2048 bytes from /dev/random and seed the PRNG with the result requires only a single line:

RAND_load_file("/dev/random",2048);

</tr> {else} <tr> <td>{$admin_products->mProducts[cProducts].name}</td> <td>{$admin_products->mProducts[cProducts].description}</td> <td>{$admin_products->mProducts[cProducts].price}</td> <td>{$admin_products->mProducts[cProducts].discounted_price}</td> <td align="right" width="180"> <input type="submit" name="submit_edit_prod_{ $admin_products->mProducts[cProducts].product_id}" value="Edit" /> <input type="submit" name="submit_select_prod_{ $admin_products->mProducts[cProducts].product_id}" value="Select" /> </td> </tr> {/if} {/section} </table> {/if} <br /> <span class="admin_page_text">Add new product:</span> <br /><br /> <input type="text" name="product_name" value="[name]" size="30" /> <input type="text" name="product_description" value="[description]" size="75" /> <input type="text" name="product_price" value="[price]" size="10" /> <input type="submit" name="submit_add_prod_0" value="Add" /> </form> 4. Create a new plugin file named function.load_admin_products.php in the presentation/smarty_plugins folder, and add the following to it: < php /* Smarty plugin function that gets called when the load_admin_products function plugin is loaded from a template */ function smarty_function_load_admin_products($params, $smarty) { // Create AdminProducts object $admin_products = new AdminProducts(); $admin_products->init(); // Assign template variable $smarty->assign($params['assign'], $admin_products); }

_empID = 3 LoginName = loginName Password = password Department = department FullName = fullName Return EmployeeID End Function

If our code was to require random number generation without the added weight of the OpenSSL library, there are some system calls available on Linux systems that provide pseudo-random number generation. These are namely rand() and srand(), although many other derivatives such as srand48() and drand48() also exist depending on the precision necessary. While these functions can be useful for some applications, it is important to note that they do not provide enough statistical randomness to be considered secure when used for encryption.

// Class that deals with products administration from a specific category class AdminProducts { // Public variables available in smarty template public $mProducts; public $mProductsCount; public $mEditItem; public $mErrorMessage = ''; public $mDepartmentId; public $mCategoryId; public $mProductId; public $mCategoryName; public $mAdminCategoriesLink = 'admin.php Page=Categories'; public $mAdminProductsTarget = 'admin.php Page=Products'; // Private attributes private $mCatalog; private $mAction = ''; private $mActionedProductId; // Class constructor public function __construct() { if (isset ($_GET['DepartmentID'])) $this->mDepartmentId = (int)$_GET['DepartmentID']; else trigger_error('DepartmentID not set'); if (isset ($_GET['CategoryID'])) $this->mCategoryId = (int)$_GET['CategoryID']; else trigger_error('CategoryID not set'); $category_details = Catalog::GetCategoryDetails($this->mCategoryId); $this->mCategoryName = $category_details['name']; foreach ($_POST as $key => $value) // If a submit button was clicked ... if (substr($key, 0, 6) == 'submit') { /* Get the position of the last '_' underscore from submit button name e.g strtpos('submit_edit_prod_1', '_') is 17 */ $last_underscore = strrpos($key, '_'); /* Get the scope of submit button (e.g 'edit_dep' from 'submit_edit_prod_1') */ $this->mAction = substr($key, strlen('submit_'), $last_underscore - strlen('submit_'));

You must ensure when you use the system call rand() or its derivatives to retrieve a random number that you initialize and seed the random number generator at least once. Without a seed, or if we were to always use the same seed, the generator would pump out the same list of numbers each time. A common method for seeding is to call srand(time(NULL)); to seed on the current time.

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