By Larry Ullman
With Hypertext Preprocessor for the realm broad net, Fourth variation: visible QuickStart consultant, readers can begin from the start to get a travel of the programming language, or lookup particular initiatives to benefit simply what they should comprehend. This task-based visible reference advisor makes use of step by step directions and many screenshots to coach starting and intermediate clients this well known open-source scripting language. major expertise writer Larry Ullman courses readers in the course of the most recent advancements together with use and know-how of HTML5 with personal home page. different addressed adjustments comprise elimination of outmoded capabilities and extra effective how one can take on universal wishes.
Both starting clients, who desire a thorough creation to the know-how, and extra intermediate clients, who're trying to find a handy reference, will locate what they want here--in simple language and during comfortably obtainable examples.
Read Online or Download PHP for the Web: Visual QuickStart Guide (4th Edition) PDF
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Additional info for PHP for the Web: Visual QuickStart Guide (4th Edition)
Continues on next page Variables 41 Whether you’re dealing with scalar or nonscalar variables, don’t forget that printing out their values is an excellent debugging technique when you’re having problems with a script! Because variable types aren’t locked in (PHP is referred to as a weakly typed language), they can be changed on the fly: $variable = 1; $variable = "Greetings"; If you were to print the value of $variable now, the result would be Greetings. The following script better demonstrates the concept of assigning values to variables and then accessing those values.
Furthermore, PHP comments are never sent to the Web browser and therefore remain your secret. PHP supports three ways of adding comments. You can comment out one line of code by putting either // or # at the beginning of the line you want ignored: // This is a comment. You can also use // or # to begin a comment at the end of a PHP line, like so: print "Hello"; // Just a greeting. Although it’s largely a stylistic issue, // is much more commonly used in PHP than #. You can comment out multiple lines by using /* to begin the comment and */ to conclude it: /* This is a multi-line comment.
Don’t worry, though; this book will teach you how to use print in conjunction with other PHP features to do great and useful things with your Web site. To make the leap from creating simple, static pages to dynamic Web applications and interactive Web sites, you need variables. Understanding what variables are, the types that a language supports, and how to use them is critical. This chapter discusses the fundamentals of variables used in PHP, and later chapters cover the different types in greater detail.