Getting Started with PHP and MySQL in Java Generating Denso QR Bar Code in Java Getting Started with PHP and MySQL

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Getting Started with PHP and MySQL use none none maker togenerate none with none Visual Studio 2005/2008/2010 Overview After the <f none for none orm> tag has been displayed, the next step is to display each form element. The majority of form elements are added with the <input> tag and then relevant options are selected with the type attribute in the <input> tag. The first field added is a normal text box.

This provides a single line box in which the user can type some text. To select this type of element, use the text setting in the type attribute. You also should give the tag a name attribute.

You will use the value of the name attribute to refer to the contents of the box later. The second field added is a password box. When you use password in the type field of the <input> tag, the box behaves the same as a text box, but it disguises the data the user enters with stars or circles.

The final box added uses the submit type. This provides a clickable Submit button that can be used when the user has clicked the form. The additional attribute passed to this tag is value; this pre-fills the widget with data.

In the case of the Submit button, the value attribute changes the text displayed on the button.. NOTE Web Editors none for none A number of Web editors help you to write HTML more efficiently. A good example is a tool called Bluefish (http://bluefish.openoffice.

nl) available for Linux. With it you can use toolbar buttons to add form elements easily. A number of handy editors like this are available all operating systems, such as SciTE (http://www.

Processing the Form Displaying a none for none form and not processing it is just short of useless. To do anything useful with the form data, you need to hook up the form to some PHP that can process the data. To process a form, follow these steps:.

1. Determine whether the submit button variable exists. If the user has clicked the button, you can make the assumption that the form has been displayed and that the Submit button has been clicked.

2. If the Submit button has not been clicked, you should assume the form has not been displayed yet, so you display it. 3.

If the Submit button has been clicked, you then process the form.. Practical PHP and MySQL To demonstra te how this process works, create a new file called form2.php and add the following code:. < php if( none none $_POST["submitbutt"]) { echo "username: " . $_POST["username"] . "<br />"; echo "password: " .

$_POST["password"] . "<br />"; } else { > <form action="form2.php" method="POST"> Username <input type="text" name="username"><br /> Password <input type="password" name="password"><br /> <input type="submit" name="submitbutt" value="Login!"><br /> </form> < php } >.

When underst anding this code, it helps to put yourself in the position of the PHP interpreter and assume you have never sent the page before. The very start of this example contains the if statement. This line checks to see if the Submit button has been clicked.

This is determined by checking if there is a GET variable with the same name as the Submit button (submitbutt). In PHP, a number of special commands can be used to access certain types of variables. In this particular example, you are using $_POST["submitbutt"] to refer to the submitbutt POST variable.

If you were to use GET as the method, you also could use $_GET["submitbutt"].. NOTE Super What The $_GET and $_POST features in PHP are known as superglobals in PHP lingo and they are used to access different types of information. As an example, $_GET is used to access GET variables..

The if line none none simply checks to see if this variable exists. If the variable exists, the contents of the other GET variables are then displayed on the screen by referencing them in the same way. If the variable does not exist, you need to assume the form has not been displayed yet, and the else is run.

You can see how to actually break.
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