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PHP:Magic Constant

PHP Magic Constant

There are a number of predefined constants available to your scripts. We will use these constants as we need them; there's a sample:

PHP: Magic Constant

PHP Magic Constant
__LINE__ The current line number of the file.
__FILE__ The full path and filename of the file.
__FUNCTION__ The function name
__CLASS__ The class name
__METHOD__ The class method name
PHP_VERSION The PHP version
PHP_INT_MAX The PHP integer value limit

__LINE__

The current line number of the file.

<?php

echo "The Line number : ". __LINE__;

?>

Output The Line number : 2

__FILE__

The full path and filename of the file.

<?php

echo  "Your file name :". __FILE__;

?>

Output Your file name : C:xampplitehtdocsmagic_constantfile.php

__FUNCTION__,     __CLASS__,     __METHOD__

The function name The class name The class method name

<?php

class demo

{

function test()

{

echo "Function of demo class : ". __FUNCTION__ ."<br/>";

}

function testme()

{

echo "Method of demo class : ". __METHOD__ ."<br/>";

echo "Class : ". __CLASS__;
				
}

}

$object=new demo();

$object->test();

$object->testme();

?>

Output Function of demo class : test Method of demo class : demo::testme Class : demo

PHP_VERSION

The PHP version

<?php

echo "Current PHP Version you are using  : ".PHP_VERSION;

?>
Output Current PHP Version you are using : 5.3.1

PHP_INT_MAX

The PHP integer value limit

<?php

echo "Integer Maximum Value : ".PHP_INT_MAX;

?>

Output Integer Maximum Value : 2147483647

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