Is this a valid PHP code?

Can somebody tell me whether this is a valid PHP code?

<?php
// This theme uses Featured Images (also known as post thumbnails) for 
per-post/per-page Custom Header images
	add_theme_support( 'post-thumbnails' );

	// Add support for custom headers.
	$custom_header_support = array(
		// The default header text color.
		'default-text-color' => '000',
		// The height and width of our custom header.
		'width' => apply_filters( 'twentyeleven_header_image_width', 1000 ),
		'height' => apply_filters( 'twentyeleven_header_image_height', 180 ),
		// Support flexible heights.
		'flex-height' => true,
		// Random image rotation by default.
		'random-default' => true,
		// Callback for styling the header.
		'wp-head-callback' => 'twentyeleven_header_style',
		// Callback for styling the header preview in the admin.
		'admin-head-callback' => 'twentyeleven_admin_header_style',
		// Callback used to display the header preview in the admin.
		'admin-preview-callback' => 'twentyeleven_admin_header_image',
	);
?>

I am trying to change the default header image size (in wp THEME 2011) 
to a height of 180px but it doesn't seem to work and I don't know what 
is causing the problem.

THANKS.


-- 
Good Guy
Website: http://mytaxsite.co.uk
Website: http://html-css.co.uk
Email: http://mytaxsite.co.uk/contact-us


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