Code Duplication    Length = 4-4 lines in 2 locations

src/wp-includes/ms-functions.php 2 locations

@@ 430-433 (lines=4) @@
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	   	$errors->add('user_name', __( 'Please enter a username.' ) );
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	$illegal_names = get_site_option( 'illegal_names' );
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	if ( ! is_array( $illegal_names ) ) {
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		$illegal_names = array(  'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
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		add_site_option( 'illegal_names', $illegal_names );
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	}
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	if ( in_array( $user_name, $illegal_names ) ) {
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		$errors->add( 'user_name',  __( 'Sorry, that username is not allowed.' ) );
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	}
@@ 557-560 (lines=4) @@
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	$errors = new WP_Error();
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	$illegal_names = get_site_option( 'illegal_names' );
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	if ( $illegal_names == false ) {
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		$illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
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		add_site_option( 'illegal_names', $illegal_names );
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	}
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	/*
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	 * On sub dir installs, some names are so illegal, only a filter can