Comments in PHP <html> < frame> <?php //This is a comment /* This is a comment block */ ?> </body> </html> PHP Variables As with algebra, PHP multivariates are used to hold value or expressions. A inconstant evoke have a short anticipate, like x, or a more descriptive remark, like carName. Rules for PHP inconstant touchs: * Variables in PHP starts with a $ sign, followed by the make out of the variable * The variable name must begin with a letter or the punctuate character * A variable name can whole tone down alpha-numeric characters and underscores (A-z, 0-9, and _ ) * A variable name should not contain spaces * Variable names are skid sensitive (y and Y are two different variables) * Creating (Declaring) PHP Variables * PHP has no command for declaring a variable. * A variable is created the moment you first-class honours leg assign a value to it: * $myCar=Volvo; * After the execution of the reason above, the variable myCar will hold the value Volvo. * Tip: If you necessity to create a variable without assigning it a value, departed you assign it the value of null. * Lets create a variable containing a string, and a variable containing a number: * <?php $txt=Hello lout!; $x=16; ?
> PHP is a Loosely Typed Language In PHP, a variable does not need to be state onward adding a value to it. In the example above, identity card that we did not have to tell PHP which data pillow slip the variable is. PHP automatically converts the variable to the correct data type, depending on its value. In a strongly typed programm ing language, you have to declare (define) t! he type and name of the variable before using it. PHP Variable chain The scope of a variable is the portion of the script in which the variable can be referenced. PHP has four different variable scopes: * local * global * static * parameter Local domain A variable declared within a PHP course is local and can only be accessed...If you want to point a full essay, order it on our website:
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