Skip to main content

Basic PHP Constructs

By

A construct is just short for control structure. Unlike an expression the construct creates a flow of control in the code. The construct controls how or when statements are executed, in order to create a structure of code that effectively tackles the task the programmer aims to achieve. Think of constructs like a place where code gets directed (or literally constructed) during execution. Imagine a busy intersection where lots of cars need to pass through. A construct is like a traffic light that directs how the traffic flows so that there isn’t an accident.


echo:
The most basic language construct you will run into in PHP is echo. It is used to send output to the standard output stream. The construct accepts any number of expressions each separated by an argument-separator (the comma).

Concatenation:
The concatenation operator(.) is used to put two string values together.

For example:
<?php
$txt1=”Hello World!”;
$txt2=”Have a nice day!”;
echo $txt1.” “.$txt2;
?>


Labels:

Comments

Post a Comment

Popular posts from this blog

MySQL Connection

By
Connection with MySQL Database Before accessing database, you must create a connection to the database Syntax: mysql_connect(servername,username,password); where, servername specifies the server to connect to. Default value is “localhost” username specifies the username to log in with. Default value is the name of the user that owns the server process. To connect offline we use username “root”. password specifies the password to log in with. Default is “” Code : Creating connection to the database and selecting the required database <?php $con = mysql_connect(“localhost”,”root”,”"); if (!$con) { die(‘Could not connect: ‘ . mysql_error()); } else{ mysql_select_db(“test”, $con) }; ?> Here, we have store connection in a variable called $con and trap error using die function. Closing connection The connection will be closed automatically when the script ends. To close the connection before, use the mysql_close() function: <?php $con = mysql_conne...
Post a Comment
Read more

Type Juggling and Type Casting

By
Type Juggling: PHP does not require (or support) explicit type definition in variable declaration; a variable's type is determined by the context in which the variable is used. That is to say, if a string value is assigned to variable $var, $var becomes a string. If an integer value is then assigned to $var, it becomes an integer.
2 comments
Read more

Doctype Defination

By
A Document Type Declaration, or DOCTYPE, is an instruction that associates a particular SGML or XML document (for example, a webpage) with a Document Type Definition (DTD). Syntax The general syntax for a document type declaration is: <!DOCTYPE root-element PUBLIC "FPI" ["URI"] [ <!-- internal subset declarations --> ]>
1 comment
Read more