Giving your users changeable or custom headers in themes

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Built in to WordPress, and also available for WordPress MU, is the Custom header API. This service allows you to quickly add some code to a theme’s fuinctions.php file to make the header area completely customizable. User will be able to upload a header image of their choice on their chosen theme, without affecting other blogs using the same theme.

You may want to try this first on a test site of WPMU.

First, check and see if your theme has a functions.php file included. If it doesn’t, make a blank file called functions.php. If it already has code in it, which it will if the theme is widget enabled, then you can paste this code in right before the last ?> tag.

//make changeable header
define('HEADER_TEXTCOLOR', '');
define('HEADER_IMAGE', 'setta.jpg'); // %s is theme dir uri and image filename
define('HEADER_IMAGE_WIDTH', 985);  // make sure these values match the theme header
define('HEADER_IMAGE_HEIGHT', 200);
define( 'NO_HEADER_TEXT', true );

function atypxmas_admin_header_style() {   // change atypxmas to your theme name
?>

// this part adds the header in the admin area
#headimg {
height: <?php echo HEADER_IMAGE_HEIGHT; ?>px;
width: <?php echo HEADER_IMAGE_WIDTH; ?>px;
}

#headimg h1, #headimg #desc {
display: none;}
}

function header_style() {
?>

#header{
background: url(<?php header_image() ?>) no-repeat;}
}

add_custom_image_header(’header_style’, ‘atypxmas_admin_header_style’);  // change atypxmas to your theme name you used above.

And that’s it! Everything else is handled internally by WordPress. To make things even easier, here’s a copy of a sample functions.php file. Please read the code and change the values accordingly for your specific theme, including the filename.

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