What is veriables?

Variables are "containers"that can storing information.
PHP, a variable starts with the $ sign, followed by the name of the variable.

For example:-

<?php
$txt = "Hello!";
$x = 50;
$y = 101.5;

echo $txt;
echo " ";
echo $x;
echo " ";
echo $y;

Here php starts with "<?php" and end with "?> " , and $ sign used to declare variable. now $text stores a string value , $x will stores the numeric value and $y stores the decimal values simultaneously. So now we have to print this values in output. therefore we use echo for print the output value.

Comments

How can make a comment in php?

Comments: In PHP code, Comment is a line that is not executed but it helps to other to understand what are you doing in program and why you are using the comment line or it's work as a reminder to know what you did in the program last time. But there is many types of comment line like single line and multi line comments: Example for Single line comment: <?php echo "Hello my Friends"; //This is a single-line comment echo "You will be a good please read all my blogs"; ?> Here is another exaple of Multiple line comment " example :  <?php  echo "Hello my Friends"; echo "Hello my Friend...

Apache Hadoop

What Is Apache Hadoop? The Apache Hadoop project develops open-source software for reliable, scalable, distributed computing. The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-availability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-available service on top of a cluster of computers, each of which may be prone to failures. The project includes these modules: · Hadoop Common : The common utilities that support the other Hadoop modules. · Hadoop Distributed File System (HDFS) : A distributed file system that provides high-thr...

TWO DIMENSIONAL DATA IN TABULAOR FORM

Now Friends if your concept about array is cleared so now we can try to excute this 2D array in tabular form , that we clearly understand how data stores in an array This is very easy concept I am sharing to understand how can we store the data in 2D array . For example: <html > <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title>2D array</title> </head> <body> <?php error_reporting(0); $x=array( data_1=>array('name'=>'suraj kumar', 'dob'=> '20.10.1980', 'age'=> '30','salary'=>50000), data_2=>array('name'=>'Amit kumar', 'dob'=> '22.1.1990', 'age'=> '30','salary'=>40000), data_3=>array('name'=>'pankaj kumar', 'dob'=> '02.12.1990', 'age'=> '30','salary'=>20000), data...

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