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Download e-book for iPad: A programmer's introduction to PHP 4.0 by W Jason Gilmore

By W Jason Gilmore

No topic what language you're acquainted with, this ebook will profit you. starting with a fast creation to PHP's syntax and simple performance, you'll speedily comprehend personal home page. The publication then steers you towards complex concerns, like PHP's position in database manipulation, periods, and person interactivity.

Author W. J. Gilmore additionally examines how personal home page can paintings with XML, JavaScript, and the part item version (COM). He a lot the ebook with useful examples and a number of other tasks that may be instantly integrated on any web site. The important A Programmer's advent to Hypertext Preprocessor 4.0 indicates you ways to utilize PHP's robust services, despite your present scope of personal home page knowledge.

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Extra resources for A programmer's introduction to PHP 4.0

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Interestingly, variables do not have to be explicitly declared in PHP, much as is the case with the Perl language. Rather, variables can be declared and assigned values simultaneously. Furthermore, a variable's data type is implicitly determined by examining the kind of data that the variable holds. "; // $sentence evaluates to string. 99; // $price evaluates to a floating-point 61 $weight = 185; // $weight evaluates to an integer. You can declare variables anywhere in a PHP script. However, the location of the declaration greatly influences the realm in which a variable can be accessed.

This is beyond the scope of this book. I suggest checking out the Apache documentation for a complete explanation of these options: 5. a 6. -other-configuration-options 7. make 8. make install 9. conf file. Some of these modifications relate specifically to Apache, while others are necessary to ensure that PHP scripts can be recognized and sent to the Web server. First, locate the line that reads: 10. phps These lines need to be uncommented in order for PHP-enabled files to work correctly on the server.

The concept of objects and classes is integral to the notion of object-oriented programming (OOP). Contrary to the other data types contained in the PHP language, an object must be explicitly declared. It is important to realize that an object is nothing more than a particular instance of a class, which acts as a template for creating objects having specific characteristics and functionality. Therefore, a class must be defined before an object can be declared. A general example of class declaration and subsequent object instantiation follows: class appliance { var power; function set_power($on_off) { $this->power = $on_off; } } ...

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