Pro PHP Patterns, Frameworks, Testing and More - download pdf or read online

By Kevin McArthur

ISBN-10: 1430202793

ISBN-13: 9781430202790

ISBN-10: 1590598199

ISBN-13: 9781590598191

Pro personal home page offers skilled builders with a radical advisor to the language's key complex positive factors, concentrating on either contemporary and rising gains and improvement tendencies. complicated object-oriented positive aspects, documentation, debugging, software program styles, and the normal Hypertext Preprocessor Library are only a number of the issues coated in vast element. writer and famous Hypertext Preprocessor professional Kevin McArthur additionally examines rising practices and tendencies similar to the MVC structure as utilized to Hypertext Preprocessor, with targeted emphasis put upon the more and more renowned Zend Framework. The publication additionally covers JSON, the cleaning soap extension, and complicated internet prone topics.

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Example text

They also have different usage syntax. Instead of extending from an interface, you use the implements keyword to put in force an interface’s rules on a class. In some cases, you will want to determine if a class is of a certain type or if it implements a specific interface. The instanceof operator is particularly useful for this task. The instanceof operator checks three things: if an instance is of a specific type, if an instance derives from a specific type, and if an instance or any of its ancestors implement a specific interface.

Table 4-1 lists the methods that provide this data. Table 4-1. Exception Methods Method Description getMessage() Returns the exception message, which is a string describing the error state getCode() Returns the error code getFile() Returns the source file in which the error occurred; useful for locating where an exception was thrown getLine() Gets the line in the source file where the exception was thrown; should be used with getFile() getTrace() Returns an array containing the context backtrace, which is a list of all the methods that are currently executing and their order getTraceAsString() Same as getTrace(), but returned as a string instead of an array __toString() Returns the entire exception represented as a string The getTrace() method is very useful because each key in the array also contains the file, line, function name, and most important, all the arguments with which the function was called.

You can use an interface to define the common functionality and create a factory pattern to make your API easier to use, as shown in Listing 3-5. Listing 3-5. fm Page 26 Friday, February 1, 2008 10:24 AM 26 CHAPTER 3 ■ SINGLETON AND FA CTORY PATTERNS public function getHeight() { return $this->_height; } public function getData() { return $this->_data; } } class ImageFactory { public static function factory($file) { $pathParts = pathinfo($file); switch(strtolower($pathParts['extension'])) { case 'jpg': $ret = new Image_JPEG($file); break; case 'png'; $ret = new Image_PNG($file); break; default: //Problem } if($ret instanceof IImage) { return $ret; } else { //Problem } } } Now, when you use the factory method with your image file name, you will get a different object depending on what type of file you pass in.

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Pro PHP Patterns, Frameworks, Testing and More by Kevin McArthur


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