Constant: Constant refers to fixed value that does not change the value
during the execution of program. Constant are defined using PHP’s
define () function which accept two arguments. The $ prefixed is not
required for constant.A simple Example :
during the execution of program. Constant are defined using PHP’s
define () function which accept two arguments. The $ prefixed is not
required for constant.A simple Example :
<?php
//define constant
define(‘PI’,3.14);
$r=5;
//use constant
$area=PI*$r*$r;
echo “Area of circle=”.$area;
?>
//define constant
define(‘PI’,3.14);
$r=5;
//use constant
$area=PI*$r*$r;
echo “Area of circle=”.$area;
?>
Result – 78.5
Practical example:
This script is used for data base connection.
<?php
define(‘MYSQL_HOST’,’localhost’);
define(‘MYSQL_USER’,’root’);
define(‘MYSQL_PASS’,”);
?>
define(‘MYSQL_HOST’,’localhost’);
define(‘MYSQL_USER’,’root’);
define(‘MYSQL_PASS’,”);
?>
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