site_url filter-hook . WP 1.0

This filter is documented in wp-includes/link-template.php

Usage

add_filter( 'site_url', 'filter_function_name_5635', 10, 3 );
function filter_function_name_5635( $option, $string, $null ){
	// filter...

	return $option;
}

$option

-

$string

-

$null

-

Where the hook is called

$site_url = apply_filters( 'site_url', get_option( 'siteurl' ), '', null, null );

return apply_filters( 'site_url', $url, $path, $scheme, $blog_id );

Where in WP core the hook is used WordPress