How to create associative array using foreach loop

Question

$featured_posts = get_field('parts', $postId->ID);

if( $featured_posts ):

    foreach( $featured_posts as $post ):

        setup_postdata($post);
        $permalink = get_permalink( $part->ID );
        $title = get_the_title( $part->ID );

        //make array
        $part_pages = array(
            $permalink => $title,
        );

    endforeach;

    wp_reset_postdata();
    
endif;

I'm trying to create an associative array using a foreach loop, but I'm getting an error. Any help would be greatly appreciated.

Answer 1

To set the required data in an associative array, try the following (commented) :

$featured_posts = get_field('parts', $postId->ID);

if( $featured_posts ):
    // 在foreach循环之前始终初始化数组变量
    $part_pages = array(); 

    foreach( $featured_posts as $post ): 

        setup_postdata($post); 
        $permalink = get_permalink( $post->ID );
        $title = get_the_title( $post->ID );

        // 将链接设置为键，标题设置为值
        $part_pages[$permalink] = $title;

    endforeach; 

    wp_reset_postdata();

    // 测试输出
    echo '<pre>' . print_r($part_pages, true) . '</pre>';
    
endif;

Note: $partThe variable is undefined.