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bool define ( string $name , mixed $value [, bool $case_insensitive = false ] )

<?php
// Case-sensitive constant name
define("GREETING", "Welcome to tutorialpro.org");
echo GREETING;    // Outputs "Welcome to tutorialpro.org"
echo '<br>';
echo greeting;   // Outputs "greeting" with a warning, indicating the constant is undefined
?>

<?php
// Case-insensitive constant name
define("GREETING", "Welcome to tutorialpro.org", true);
echo greeting;  // Outputs "Welcome to tutorialpro.org"
?>

<?php
define("GREETING", "Welcome to tutorialpro.org");

function myTest() {
    echo GREETING;
}

myTest();    // Outputs "Welcome to tutorialpro.org"
?>