A considerable portion of my consulting time has recently revolved around the optimization of corporate blogs (or the addition of blogs to revamped sites). As usual, I find a pattern emerging in the strategies that need attention and the pitfalls that must be avoided. So, rather than charging $400 an hour to give advice on the subject, I thought it would be valuable to share many of the most common pieces of...

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Just like the previous lesson, the require command is used to include a file into your PHP code. However there is one huge difference between the two commands, though it might not seem that big of a deal. Require vs IncludeWhen you include a file with the include command and PHP cannot find it you will see an error message like the following: PHP Code:<?php include("noFileExistsHere.php"); echo "Hello World!"; ?> Display:Warning:...

Without understanding much about the details of PHP, you can save yourself a great deal of time with the use of the PHP include command. include takes a file name and simply inserts that file's contents into the script that issued the include command. Why is this a cool thing? Well, first of all, this means that you can type up a common header or menu file that you want all your web pages to include. When you add a new page...

Comments in PHP are similar to comments that are used in HTML. The PHP comment syntax always begins with a special character sequence and all text that appears between the start of the comment and the end will be ignored. In HTML a comment's main purpose is to serve as a note to you, the web developer or to others who may view your website's source code. However, PHP's comments are different in that they will not be displayed...

In all programming languages, operators are used to manipulate or perform operations on variables and values. You have already seen the string concatenation operator "." in the Echo Lesson and the assignment operator "=" in pretty much every PHP example so far. There are many operators used in PHP, so we have separated them into the following categories to make it easier to learn them all. Assignment Operators Arithmetic...

In the last lesson, PHP Echo, we used strings a bit, but didn't talk about them in depth. Throughout your PHP career you will be using strings a great deal, so it is important to have a basic understanding of PHP strings. PHP - String CreationBefore you can use a string you have to create it! A string can be used directly in a function or it can be stored in a variable. Below we create the exact same string twice: first...

As you saw in the previous lesson, the PHP command echo is a means of outputting text to the web browser. Throughout your PHP career you will be using the echo command more than any other. So let's give it a solid perusal! Outputting a StringTo output a string, like we have done in previous lessons, use PHP echo. You can place either a string variable or you can use quotes, like we do below, to create a string that the echo...

If you have never had any programming, Algebra, or scripting experience, then the concept of variables might be a new concept to you. A detailed explanation of variables is beyond the scope of this tutorial, but we've included a refresher crash course to guide you. A variable is a means of storing a value, such as text string "Hello World!" or the integer value 4. A variable can then be reused throughout your code, instead...

Before we talk about PHP's syntax, let us first define what syntax is referring to. Syntax - The rules that must be followed to write properly structured code. PHP's syntax and semantics are similar to most other programming languages (C, Java, Perl) with the addition that all PHP code is contained with a tag, of sorts. All PHP code must be contained within the following... PHP Code:<?php ?> or the shorthand PHP tag...

To begin working with PHP you must first have access to either of the following: A web hosting account that supports the use of PHP web pages and grants you access to MySQL databases. If you do not have a host, but are interested in signing up for one, we recommend that you first read our Web Host Guide to educate yourself about web hosting and avoid getting ripped off. Have PHP and MySQL installed on your own computer. Read...

PHP Tutorial - Learn PHPIf you want to learn the basics of PHP, then you've come to the right place. The goal of this tutorial is to teach you the basics of PHP so that you can: Customize PHP scripts that you download, so that they better fit your needs. Begin to understand the working model of PHP, so you may begin to design your own PHP projects. Give you a solid base in PHP, so as to make you more valuable in the eyes of...

Ever wonder how you could change the contents of an HTML element? Maybe you'd like to replace the text in a paragraph to reflect what a visitor has just selected from a drop down box. By manipulating an element's innerHtml you'll be able to change your text and HTML as much as you like. Changing Text with innerHTMLEach HTML element has an innerHTML property that defines both the HTML code and the text that occurs between that...

Have you ever tried to use JavaScript to do some form validation? Did you have any trouble using JavaScript to grab the value of your text field? There's an easy way to access any HTML element, and it's through the use of id attributes and the getElementById function. JavaScript document.getElementByIdIf you want to quickly access the value of an HTML input give it an id to make your life a lot easier. This small script below...

Comparing strings in JavaScript is quite easy, as long as you know about the equals operator and the JavaScript If Statement. This is all you need to know to find out if two strings of your choosing are equal. Comparing one String to another StringBelow we have created a fake authentication system and use an if statement to see if the user's name will grant them access to a special message. JavaScript Code:<script type="text/javascript"> var...

Ever want to find something in one of your JavaScript strings? Maybe even start your search halfway through the string? Well you're in luck! The string function indexOf lets you supply one required argument (the search query) and one optional argument (the offset) for all your simple searching needs. If you are looking for a more powerful search feature, you should check out JavaScript's string search function, which has...

JavaScript's String Object has a handy function that lets you replace words that occur within the string. This comes in handy if you have a form letter with a default reference of "username". With the replace function you could grab get the person's name with an HTML form or JavaScript prompt and then replace all occurrences of "username" with the value that they entered. String Replace FunctionThe string replace function has...

Knowing if something is or isn't in a string can be very important. If you have an online forum and don't want people to be able to create usernames that include swear words, you can use the search function to find bad words in usernames and reject them if any were found. String Search FunctionThis string function takes a regular expression and then examines that string to see if there are any matches for that expression....

The ability to split up a string into separate chunks has been supported in many programming languages, and it is available in JavaScript as well. If you have a long string like "Bobby Susan Tracy Jack Phil Yannis" and want to store each name separately, you can specify the space character " " and have the split function create a new chunk every time it sees a space. Split Function: DelimiterThe space character " " we mentioned...

Advanced scripters will often need to know how long a JavaScript string is. For example, if a webdeveloper was creating a submission form that required the username to be no longer than 20 characters, then she would need to check the length of the string before allowing the user to submit data. String Length PropertyThe length property returns the number of characters that are in a string, using an integer. Below is the...

This may be old news to you, but inside every JavaScript string are several functions that are just waiting to do your bidding. This is because strings in JavaScript are actually objects with a bunch of properties and functions (also called methods) that can be accessed in the following general way: Pseudo JavaScript Code:<script type="text/javascript"> var myString = "Hello Thur!"; //This is how you would access a...

Hyperlinks like this one entice visitors to click because they know clicking it will lead them to a new page. However, sometimes when you are making a script, you would like to add functionality to your website that lets a hyperlink to be clicked and perform a useful action like update the sums on the webpage, without loading a new page. It's these types of programming solutions that will utilize the JavaScript Void 0 programming...

There's nothing more troublesome than receiving orders, guestbook entries, or other form submitted data that are incomplete in some way. You can avoid these headaches once and for all with JavaScript's amazing way to combat bad form data with a technique called "form validation". The idea behind JavaScript form validation is to provide a method to check the user entered information before they can even submit it. JavaScript...