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As a Web application developer, there s one unhappy fact that you ll have to learn to live with: There are always going to be people out there who get their chuckles from finding loopholes in your code and exploiting these loopholes for malicious purposes Therefore, one of the most important things a developer can do to secure an application is to properly filter and validate all the input passing through it The following sections discuss the filtering and validation tools available in the Zend Framework, together with examples of how they can be used with Web forms to make your application more secure

Type a label in the footer, such as Average List Price. Drag the List Price field from the Fields list on the right side of your page, as shown in figure 4.23.

Figure 4.23 You can drag columns from your data source into the footer section of your Business Data List Web Part, and then format it to display aggregate information.

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Most of the time, input exploits consist of sending your application cleverly disguised values that trick it into doing something it really, really shouldn t A common example of this type of exploit is the SQL injection attack, wherein an attacker remotely manipulates your database with an SQL query embedded inside form input Therefore, one of the most important things a developer must do before using any input supplied by the user is to sanitize it by removing any special characters or symbols from it PHP comes with various functions to assist developers in the task of sanitizing input For example, the addslashes() function escapes special characters (like quotes and backslashes) in input so that it can be safely entered into a database, while the strip_tags() function strips all the HTML and PHP tags out of a string, returning only the ASCII content There s also the htmlentities() function, which is commonly used to replace special characters like ", &, <, and > with their corresponding HTML entity values, rendering them harmless Here s an example of sanitizing form input with the htmlentities() function:

Click the yellow bolt of lightning to choose an aggregate function, as shown in figure 4.24. Select Average. Format the value as currency, as we did earlier.

< php // define array of sanitized data $sanitized = array(); // strip tags from POST input if (isset($_POST['name']) && !empty($_POST['name'])) { $sanitized['name'] = htmlentities($_POST['name']); } // processing code // >

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The aggregate functions are useful for providing summary information to the user, such as how many items are in a view, or a sum of this month s sales. You might want to use this area to simply display an image or text. Now that we ve configured the web part in SharePoint Designer, you may want to tweak it further by manually modifying the XSL.

When it comes to filtering user input, the Zend Framework does a lot of the heavy lifting for you The Zend_Filter component provides a comprehensive set of input filters, which can either be attached to form elements with the addFilter() method or used on a stand-alone basis for ad-hoc input sanitization Here s an example of using the HTMLEntities filter on a text input field:

Figure 4.24 The above image displays the available aggregate functions in the Business Data List footer.

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