WordPress Conditional Tag for Login Page

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WordPress have conditional tags. The Conditional Tags can be used in your Template files to change what content is displayed and how that content is displayed on a particular page depending on what conditions that page matches

Following conditional tag is specific to Login Page, that is currently not available on WordPress Codex

if ( in_array( $GLOBALS['pagenow'], array( 'wp-login.php', 'wp-register.php' ) ) ) {
//Conditional statement here
}