如何从非 function.php 文件中覆盖不可插入的父主题函数？

Question

我想减少我的父主题生成的图像文件的数量。经过一番研究，我发现为此我需要从父主题的 php 文件 (not function.php) 中覆盖一个函数，但这是不可能的，因为 此函数不可插入（不包含在 if (!function_exists()) 条件中）。现在，我只是将父函数包装在 if (!function_exists()) 条件中，并在我的子主题 function.php 文件中覆盖它。

在所描述的情况下，是否可以覆盖父函数而不更改父主题？我在这里问是因为我没有得到开发者的任何反应。

我尝试使用子主题和插件中的下一个代码删除父主题功能，但这没有帮助：

function remove_fastnews_actions() {
    remove_action('after_setup_theme','kopa_front_after_setup_theme');
}
add_action('after_setup_theme','remove_fastnews_actions');
//add_action('wp_loaded','remove_fastnews_actions');

这是我需要重写的函数（它更大，所以我只保留了我真正需要更改的内容）：

add_action('after_setup_theme', 'kopa_front_after_setup_theme');

function kopa_front_after_setup_theme() {
    $sizes = array(
        'flexslider-image-size'   => array(500, 500, TRUE, __('Flexslider Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-image-size' => array(300, 277, TRUE, __('Article List Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-sm-image-size' => array(120, 120, TRUE, __('Article List Small Post Image (Kopatheme)', kopa_get_domain())),
        'article-carousel-image-size' => array(354, 354, TRUE, __('Article Carousel Post Image (Kopatheme)', kopa_get_domain())),
        'entry-list-image-size' => array(227, 182, TRUE, __('Entry List Thumbnail Image (Kopatheme)', kopa_get_domain())),
        'blog-image-size' => array(680, 419, TRUE, __('Blog Image Size (Kopatheme)', kopa_get_domain())),
    );

    apply_filters('kopa_get_image_sizes', $sizes);

    foreach ($sizes as $slug => $details) {
        add_image_size($slug, $details[0], $details[1], $details[2]);
    }
}

相同的父函数可插入：

if( !function_exists('kopa_front_after_setup_theme') )
{

add_action('after_setup_theme', 'kopa_front_after_setup_theme');

function kopa_front_after_setup_theme() {
    $sizes = array(
        'flexslider-image-size'   => array(500, 500, TRUE, __('Flexslider Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-image-size' => array(300, 277, TRUE, __('Article List Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-sm-image-size' => array(120, 120, TRUE, __('Article List Small Post Image (Kopatheme)', kopa_get_domain())),
        'article-carousel-image-size' => array(354, 354, TRUE, __('Article Carousel Post Image (Kopatheme)', kopa_get_domain())),
        'entry-list-image-size' => array(227, 182, TRUE, __('Entry List Thumbnail Image (Kopatheme)', kopa_get_domain())),
        'blog-image-size' => array(680, 419, TRUE, __('Blog Image Size (Kopatheme)', kopa_get_domain())),
    );

    apply_filters('kopa_get_image_sizes', $sizes);

    foreach ($sizes as $slug => $details) {
        add_image_size($slug, $details[0], $details[1], $details[2]);
    }
}

}

以及覆盖父函数的子主题函数：

add_action('after_setup_theme', 'kopa_front_after_setup_theme');

function kopa_front_after_setup_theme() {
    $sizes = array(
        'flexslider-image-size'   => array(0, 0, TRUE, __('Flexslider Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-image-size' => array(0, 0, TRUE, __('Article List Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-sm-image-size' => array(120, 120, TRUE, __('Article List Small Post Image (Kopatheme)', kopa_get_domain())),
        'article-carousel-image-size' => array(0, 0, TRUE, __('Article Carousel Post Image (Kopatheme)', kopa_get_domain())),
        'entry-list-image-size' => array(0, 0, TRUE, __('Entry List Thumbnail Image (Kopatheme)', kopa_get_domain())),
        'blog-image-size' => array(0, 0, TRUE, __('Blog Image Size (Kopatheme)', kopa_get_domain())),
    );

    apply_filters('kopa_get_image_sizes', $sizes);

    foreach ($sizes as $slug => $details) {
        add_image_size($slug, $details[0], $details[1], $details[2]);
    }
}

Answer 1

既然原来的函数在函数中有一个过滤器，为什么不利用它呢？在您的functions.php 中，类似（未经测试的代码）：

add_filter('kopa_get_image_sizes', 'override_kopa_images');

function override_kopa_images($sizes) {
    $new_sizes = array(
        'flexslider-image-size'   => array(0, 0, TRUE, __('Flexslider Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-image-size' => array(0, 0, TRUE, __('Article List Post Image (Kopatheme)', kopa_get_domain())),
        'article-list-sm-image-size' => array(120, 120, TRUE, __('Article List Small Post Image (Kopatheme)', kopa_get_domain())),
        'article-carousel-image-size' => array(0, 0, TRUE, __('Article Carousel Post Image (Kopatheme)', kopa_get_domain())),
        'entry-list-image-size' => array(0, 0, TRUE, __('Entry List Thumbnail Image (Kopatheme)', kopa_get_domain())),
        'blog-image-size' => array(0, 0, TRUE, __('Blog Image Size (Kopatheme)', kopa_get_domain())),
    );
    return $new_sizes;
}

或者，您可以使用输入变量$sizes 来更改单个条目，例如

add_filter('kopa_get_image_sizes', 'override_kopa_images');

function override_kopa_images($sizes) {
    $sizes['flexslider-image-size'] = array(0, 0, TRUE, __('Flexslider Post Image (Kopatheme)', kopa_get_domain()));
    return $sizes;
}