New PDF release: Advanced PHP for Web Professionals

By Christopher Cosentino

Take your Hypertext Preprocessor programming abilities to the following point, with this hands-on, example-rich instructional! In complicated personal home page for net pros, best-selling Hypertext Preprocessor writer Christopher Cosentino brings jointly dozens of strong new strategies for development critical net purposes. easy methods to deal with classes extra successfully, create higher types, strengthen customized errors handlers, construct database-independent net purposes with PEAR::DB, parse XML documents, authenticate clients through database question, construct cross-platform patron apps with PHP-GTK, and masses extra!

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The function asks for the user's name and email. 28 Declare the shop function. This function does the work of adding and removing items from the user's shopping cart. 29 Allow the function to access and modify the $name, $email, $items, and $inventory variables. 32 Create the shopping form. 34 Assign a value of 0 to the $totals variable. This variable is used to show how many items are in the user's cart, which is calculated as the user adds or removes items from the cart. 35 Loop through the items in the $inventory array.

Session_start(); 3. isset($count)) { 4. session_register("count"); 5. $count = 1; 6. } 7. > 8. > times. 9. Script 2-1. php Line-by-Line Explanation LINE DESCRIPTION 2 Start the session or continue an existing session. 3 The if statement checks to see if the $count variable has been set. If the $count variable has been set, then the script assumes that this is a continuation of a session and takes no action and the script continues onto line 7. 4 If the $count variable has not been set, then the script assumes that this is the beginning of a new session and registers the variable $count.

If the user has not added any items into the cart, then all values read as 0, which is the value that was used to initialize the cart. 40 Use the next() function so that the next key is available the next time the loop is executed. 41 Add the current total of items in the user's cart for this loop to the running total of items. 42 Exit from the for loop. 44 Display the current item total to the user. 45 Display an "Add Items" button. It is used to execute the additems clause in the main program.

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