PHP Magic Constants
There are various predefine PHP Magic Constants. It starts with underscore(__) and ends with double underscore.
Let us take an example of Magic Constants
Example1.
| Magic Constant | Description |
| __LINE__ | To check current line number of the file. |
| __FILE__ | To check full path and filename of the file. |
| __FUNCTION__ | To check function name. |
| __CLASS__ | To check class name. |
| __METHOD__ | To check class method name. |
| PHP_VERSION | To check PHP version. |
| PHP_INT_MAX | To check PHP integer value limit. etc |
<!DOCTYPE html> <html> <body> <?php echo "Used of [ __LINE__ ] Magic Constant"."<br>"; echo "The Line number : ". __LINE__; ?> </body> </html>Example 2.
<?php
class test{
function test(){
echo "Function of test class : ". __FUNCTION__ ."<br/>";
}
functiontestme(){
echo "Method of test class : ". __METHOD__ ."<br/>";
echo "Class : ". __CLASS__;
}
}
$object=new test();
$object->test();
$object->testme();
?>
Output
Function of test class : test
Function of test class : test
Method of test class : test::testme
Class : test