PHP 7 Variables
Variables are "containers" for storing information
Creating ( Declaring ) PHP Variables
In PHP a variables start with the $ sign, followed by the name of the variable :
Example
<!DOCTYPE html>
<html>
<head>
<title> PHP Variables </title>
</head>
<body>
<h1> </h1>
<?php
$txt = "Hello Mr. Kumar Atul Jaiswal.";
$x = 10;
$y = 10.5;
echo $txt;
echo "<br>";
echo $x;
echo "<br>";
echo $y;
?>
</body>
</html>
Result
10
10.5
After the execution of the statements, above the variable $txt will hold the value "Hello Mr. Kumar Atul Jaiswal" the variable $x will hold the value 10, and the variable $y will hold the value 10.5 .
NOTE :- When you assign a text value to a variable, put quotes around the value.
NOTE :- Unlike other programming languages, PHP has no command for declaring a variable. It is created the moment you first assign a value to it.
- Think of variable as container for storing data.
PHP Variables
A variable can have a short name ( like x and y) or a more descriptive name ( like carname, total_volume, age, old ).
Rules for PHP variables
- A variable start with the $ sign, followed by the name of variable
- A variable name must start with a letter or a underscore character.
- A variable name cannot start with a number.
- A variable name can only contain alpha-numeric characters and under score ( like A-z, 0-9 )
- Variable names are case sensitive ( $age or $AGE are two different values).
Output variables
The php echo statement is often used to output data to the scree.
The following example will show how to output text and a variable :
Example
<!DOCTYPE html>
<html>
<head>
<title> PHP Variables </title>
</head>
<body>
<h1> </h1>
<?php
$txt = "www.kumaratuljaiswal.in";
echo "I Love $txt";
?>
</body>
</html>
Output
I Love www.kumaratuljaiswal.in
The following example will produce the same output as the example above:
Example
<!DOCTYPE html>
<html>
<head>
<title> PHP Variables </title>
</head>
<body>
<h1> </h1>
<?php
$txt = "www.kumaratuljaiswal.in";
echo "I Love " . $txt . ;
?>
</body>
</html>
Output
I Love www.kumaratuljaiswal.in
The following example will output the sum of two variables:
Example
<!DOCTYPE html>
<html>
<head>
<title> PHP Variables </title>
</head>
<body>
<h1> </h1>
<?php
$x = 10;
$y = 5;
echo $x+ $y;
?>
</body>
</html>
Output
15
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