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<?php
echo 'This is line " ' . __LINE__ . ' "';
?>

This is line “ 2 ”

<?php
echo 'This file is located at " ' . __FILE__ . ' "';
?>

This file is located at “ E:\wamp\www\test\index.php ”

<?php
echo 'This file is located at " ' . __DIR__ . ' "';
?>

This file is located at “ E:\wamp\www\test ”

<?php
function test() {
    echo 'The function name is: ' . __FUNCTION__;
}
test();
?>

The function name is: test

<?php
class test {
    function _print() {
        echo 'The class name is: ' . __CLASS__ . "<br>";
        echo 'The function name is: ' . __FUNCTION__;
    }
}
$t = new test();
$t->_print();
?>

The class name is: test
The function name is: _print

<?php
class Base {
    public function sayHello() {
        echo 'Hello ';
    }
}

trait SayWorld {
    public function sayHello() {
        parent::sayHello();
        echo 'World!';
    }
}

class MyHelloWorld extends Base {
    use SayWorld;
}

$o = new MyHelloWorld();
$o->sayHello();
?>

Hello World!

<?php
function test() {
    echo 'The method name is: ' . __METHOD__;
}
test();
?>

The method name is: test

<?php
namespace MyProject;

echo 'The namespace is: "', __NAMESPACE__, '"'; // Outputs "MyProject"
?>

The namespace is: "MyProject"