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Distortion filters are powerful tools. Although they are easy to apply, they are extremely difficult to use well. Here are some rules to keep in mind: Practice makes practical: Distortion filters are like complex vocabulary words. You don t want to use them without practicing a little first. Experiment with a distortion filter several times before trying to use it in a real project. You may even want to write down the steps you take so that you can remember how you created an effect. Use caution during tight deadlines: Distortion filters are enormous timewasters. Unless you know exactly how you want to proceed, you may want to avoid using them when time is short. The last thing you need when you re working under the gun is to get trapped trying to pull off a weird effect. Apply selectively: The effects of distortion filters are too severe to inflict all at once. You can achieve marvelous, subtle effects, however, by distorting feathered and layered selections. Although I wouldn t call the image in Figure 11-12 subtle, no single effect was applied to the entire image. I applied the Spherize filter to a feathered elliptical marquee that included most of the image. I then reapplied Spherize to the eye. I selected the hair and beard and applied the

Although functions like trigger_error() and set_error_handler() give you a lot of flexibility with raising and handling errors, they do have limitations. For example, if a piece of code calls a class method and an error occurs in that method, it would be nice if the method could simply tell the calling code about the error, rather than having to raise an error with trigger_error() and go through a central error handler. That way the calling code could take action to correct the problem, making the application more robust. One simple, common way to achieve this is to get a function or method to return a special error value, such as -1 or false. The calling code can then inspect the return value and, if it equals the error value, it knows there was a problem. However, this can get unwieldy when you start working with deeply nested function or method calls, as the following code shows:

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$form->addRule( firstName , The First Name field can contain only letters, digits, spaces, apostrophes, and hyphens , regex , /^[ \ \-a-zA-Z0-9]+$/ ); $form->addRule( lastName , Please enter your last name , required ); $form->addRule( lastName , The Last Name field can contain only letters, digits, spaces, apostrophes, and hyphens , regex , /^[ \ \-a-zA-Z0-9]+$/ ); $form->addRule( emailAddress , Please enter an email address , required ); $form->addRule( emailAddress , Please enter a valid email address , email ); $form->addRule( toEmailAddress , Please enter an email address , required ); $form->addRule( toEmailAddress , Please enter a valid email address , email ); $form->addRule( ccEmailAddress , Please enter a valid email address , email ); $form->addRule( subject , Please enter a message subject , required ); $form->addRule( subject , Your subject can contain only letters, digits, spaces, apostrophes, commas, periods, and hyphens , regex , /^[ \ \,\.

\-a-zA-Z0-9]+$/ ); $form->addRule( message , Please enter your message , required ); if ( $form->isSubmitted() and $form->validate() ) { $form->process( sendMessage ); } else { echo <p>Please fill in all the fields below (CC field is optional), then click Send Message to send your email</p> ; $renderer = new HTML_QuickForm_Renderer_Tableless(); $form->accept( $renderer ); echo $renderer->toHtml(); } function sendMessage( $values ) { $headers = From: $values[ firstName ] $values[ lastName ] < $values[ emailAddress ] >\r\n ; if ( $values[ ccEmailAddress ] ) $headers = Cc: $values[ ccEmailAddress ] \r\n ; if ( mail( $values[ toEmailAddress ], $values[ subject ], $values[ message ], $headers ) ) { echo <p>Your message has been sent</p> ; } else { echo <p>Sorry, your message could not be sent</p> ; echo <p>Please <a href= javascript:historygo(-1) >go back</a> to the form, check the fields and try again.

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</p> ; } } > </body> </html>.

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