How to hook wp_list_pages?

Question

How can I hook the wp_list_pages function so that it reads a value of a custom field and displays it instead of displaying the page title?

Answer 1

A quick Google Search came up with this

Source

Try the following:

function wp_list_pages_filter($output) {
    // modify $output here, it's a string of <li>'s by the looks of source
    return $output;
}
add_filter('wp_list_pages', 'wp_list_pages_filter');

Answer 2

A Walker Class extension would be necessary in this case:

class My_Custom_Walker extends Walker_page {
function start_el(&$output, $page, $depth, $args, $current_page) {
    if ( $depth )
        $indent = str_repeat("\t", $depth);
    else
        $indent = '';

    extract($args, EXTR_SKIP);
    $output .= $indent . 
            '<li><div>' . get_post_meta($post_id, $key, $single) . '</div></li>';

} // End start_el
} // End Walker Class

Then, when you use your wp_list_pages function, you would call the class:

// Call class:
$My_Walker = new My_Custom_Walker();

$args = array(
    'walker'      => $My_Walker
);

wp_list_pages( $args );

Documentation on this subject is a bit scarce so let me know if you need more help.

Answer 3

You are able to pass in your own custom walker as one of the args, use this to pass in a walker which extends Walker_Page and uses your own custom post title.