Override a WordPress parent theme function

3 Views

I am creating a child theme of flowmaster theme.I have a problem to override the parent function.
The function exists in parent’s theme: 

add_filter('loop_shop_columns', 'pt_loop_shop_columns');
function pt_loop_shop_columns(){
    if ( 'layout-one-col' == pt_show_layout() ) return 4;
    else return 3;
}

I add a function in child theme

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if ( ! function_exists( 'pt_loop_shop_columns' ) ) :
function pt_loop_shop_columns(){
    global $wp_query;
    if ( 'layout-one-col' == pt_show_layout() ) return 4;
    else return 4;
}
endif;
add_filter('loop_shop_columns', 'pt_loop_shop_columns');

Got this error:

Fatal error: Cannot redeclare pt_loop_shop_columns() (previously
declared in
C:\xampp\htdocs\futuratab\wp-content\themes\flowmaster-child\functions.php:44)
in
C:\xampp\htdocs\futuratab\wp-content\themes\flowmaster\woofunctions.php
on line 9

Please help.Thanks

Post Views: 3

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3 comments

  1. Function of child theme is executed first and then parent theme’s. Checking using function_exists should have been done in parent theme.

    To overcome this you can remove parent theme’s hook and hook your custom function to same filter.

    remove_filter('loop_shop_columns', 'pt_loop_shop_columns');

add_filter('loop_shop_columns', 'custom_pt_loop_shop_columns');

function custom_pt_loop_shop_columns(){
    global $wp_query;
    if ( 'layout-one-col' == pt_show_layout() ) return 4;
    else return 4;
}

  2. You can’t redefine a function in PHP, but you can unhook the old function and hook the new one with a different name. Something like:

    remove_filter('loop_shop_columns', 'pt_loop_shop_columns');
add_filter('loop_shop_columns', 'pt_loop_shop_columns_2');

  3. you can try this on your child theme

    function pt_loop_shop_columns() {

//NEW CODE IN HERE///////////////////////////////

return apply_filters('pt_loop_shop_columns', $link, $id);
}

add_filter('attachment_link', 'pt_loop_shop_columns');

    OR

    you can use hook on existing function 

    function pt_loop_shop_columns() {
//code goes here
}

$hook = 'get_options'; // the function name you're filtering
add_filter( $hook, 'pt_loop_shop_columns' );

    OR

    And last method is 

     function remove_thematic_actions() {
remove_action('thematic_header','thematic_blogtitle',3);
}
// Call 'remove_thematic_actions' during WP initialization
add_action('init','remove_thematic_actions');

// Add our custom function to the 'thematic_header' phase
add_action('thematic_header','fancy_theme_blogtitle', 3);

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