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

By W Jason Gilmore

ISBN-10: 1893115852

ISBN-13: 9781893115859

- study the basics of Hypertext Preprocessor programming- no toy code the following - Buid dynamic, database-drive websites - Lot of ready-to-use code for incorporation into your personal website! within the fast paced setting of internet improvement, builders are continuously lo

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Extra resources for A Programmer's Introduction to PHP 4.0

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11. conf file, again opening it up in a text editor. There are a few more modifications that you need to make: 18 Gilmore_01 12/5/00 10:22 AM Page 19 [(H1L)] Look for this line: ScriptAlias /cgi-bin/ "C:/Apache/cgi-bin/" Directly below this line, add the following: ScriptAlias /php4/ "C:/php4/" Then search for “AddType”. phps Keep scrolling down. You will find the following commented lines: # # Action lets you define media types that will execute a script whenever # a matching file is called. This eliminates the need for repeated URL # pathnames for oft-used CGI file processors.

An alternative method for declaring a variable to be global is to use PHP’s $GLOBALS array. Reconsidering the above example, I use this array to declare the variable $somevar to be global: $somevar = 15; function addit() { $GLOBALS["somevar"]; $somevar++; } addit(); print "Somevar is $somevar"; 44 Gilmore_02 12/4/00 1:04 PM Page 45 Variables and Data Types Regardless of the method you choose to convert a variable to global scope, be aware that the global scope has long been a cause of grief among programmers due to unexpected results that may arise from their careless use.

Chapter 6, “Object-Oriented PHP,” introduces PHP’s OOP implementation in further detail. Boolean, or True/False, Values The boolean data type is essentially capable of representing only two data types: true and false. Boolean values can be determined in two ways: as a comparison evaluation or from a variable value. Both are rather straightforward. Comparisons can take place in many forms. Evaluation typically takes place by use of a double equal sign and an if conditional. Here is an example: if ($sum == 40) : .

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A Programmer's Introduction to PHP 4.0 by W Jason Gilmore

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