PHP for the Web: Visual QuickStart Guide (4th Edition) by Larry Ullman

By Larry Ullman

With personal home page for the realm broad net, Fourth version: visible QuickStart consultant, readers can begin from the start to get a journey of the programming language, or search for particular initiatives to benefit simply what they should be aware of. This task-based visible reference advisor makes use of step by step directions and lots of screenshots to coach starting and intermediate clients this well known open-source scripting language. prime expertise writer Larry Ullman publications readers during the newest advancements together with use and knowledge of HTML5 with personal home page. different addressed adjustments comprise elimination of outmoded features and extra effective how you can take on universal wishes.

Both starting clients, who desire a thorough advent to the know-how, and extra intermediate clients, who're searching for a handy reference, will locate what they wish here--in trouble-free language and during without difficulty available examples.

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Extra info for PHP for the Web: Visual QuickStart Guide (4th Edition)

Example text

Variable names are case-sensitive! Consequently, $variable and $Variable are two different constructs, and it would be a bad idea to use two variables with such similar names. This last point is perhaps the most important: variable names in PHP are casesensitive. Using the wrong letter case is a very common cause of bugs. ) A Misspelling a variable’s name, including its case, will create undesired and unpredictable results. 2 Properly documenting the purposes of variables, along with using meaningful names, is a hallmark of a professional programmer.

Scripts often don’t work as you expect them to because one or more variables do not have the values you assume they should, so confirming their actual values is extremely helpful. If you don’t use the HTML


tags, the result will be like the mess in C. php page, different servers will generate different results (compare with Figure A). C With large, complex variables such as $_SERVER, not using the HTML preformatting tags with print_r() creates an incomprehensible mess (compare to Figures A and B).

To be clear, print doesn’t actually print anything; it just outputs data. When a PHP script is run through a Web browser, that PHP output is received by the browser itself. Also notice that the line is terminated with a semicolon (;). Every statement in PHP code must end with a semicolon, and forgetting this requirement is a common cause of errors. A statement in PHP is an executable line of code, like print "something"; or phpinfo(); Conversely, comments, PHP tags, control structures (conditionals, loops, and so on), and certain other constructs discussed in this book don’t require semicolons.

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