How to override parent functions in child themes?

I’ve been reading around and trying to figure out how to do this, but for some reason I can’t seem to override parent functions in my child theme.

I’m using TwentyTen as a parent – can anyone tell me why this function in my child theme isn’t overriding the parent function please?

// Override read more link
function osu_twentyten_continue_reading_link() {
 return ' <a href="'. get_permalink() . '" rel="nofollow noreferrer noopener" rel="nofollow noreferrer noopener">' . __( 'Read on <span class="meta-nav">&rarr;</span>', 'twentyten-child' ) . '</a>';
}
function osu_twentyten_auto_excerpt_more( $more ) {
 return ' &hellip;' . osu_twentyten_continue_reading_link();
}
remove_filter( 'excerpt_more', 'twentyten_auto_excerpt_more' );
add_filter( 'excerpt_more', 'osu_twentyten_auto_excerpt_more' );

I thought you had to remove the filter/action etc. before re-adding it right?

Thanks,

osu

Answers:

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Method 1

You should run the code after theme setup.

function osu_twentyten_continue_reading_link() {
    return ' <a href="'. get_permalink() . '" rel="nofollow noreferrer noopener" rel="nofollow noreferrer noopener">' . __( 'Read on <span class="meta-nav">&rarr;</span>', 'twentyten-child' ) . '</a>';
}

function osu_twentyten_auto_excerpt_more( $more ) {
    return ' &hellip;' . osu_twentyten_continue_reading_link();
}

function my_child_theme_setup() {
    remove_filter( 'excerpt_more', 'twentyten_auto_excerpt_more' );
    add_filter( 'excerpt_more', 'osu_twentyten_auto_excerpt_more' );
}

add_action( 'after_setup_theme', 'my_child_theme_setup' );

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