Wordpress：无法在functions.php中检索帖子内容

Question

I have written something that will send me an email with the contents of a post once it is published. I am able to get the title, category, author and permalink from the post and show it in the mail, but not the content!

<?php

// Function that runs when a post is published
function run_when_post_published() {

    $post = get_post($post_id);
    $author = get_userdata($post->post_author);
    $category = get_the_category();
    $author_id = $post->post_author;
    $author = get_the_author_meta( 'nickname', $author_id ); 
    $title = get_the_title();
    $permalink = get_permalink();
    $my_content = get_the_content();

    $email_subject = '(' . $category[0]->cat_name . ') Case fra kundelogg: ' . $title;
    $message = $my_content . 'Written by: ' . $author . ', Link: ' . $permalink;
    $headers = 'From: CRM System <mail@mail.com>';

// Advanced custom field to check if post is supposed to be mailed or not
if( !empty($_POST['fields']['field_52fc8615d3526'] ) ) {

    $email = 'myemail@mycompany.com';
    wp_mail( $email, $email_subject, $message );

}
else { // Do nothing }

}

// Makes sure email only gets sent the first time a post is published
add_action('new_to_publish', 'run_when_post_published');        
add_action('draft_to_publish', 'run_when_post_published');      
add_action('pending_to_publish', 'run_when_post_published');
?>

I have tried numerous ways of getting the content to show up in the mail, and in some cases i acctually got between two to six characters to show up. But not the whole content. It is like the content is truncated randomly, but this is not the case. The example in the code above with get_the_content() does not show anything though.

Answer 1

Replace $my_content inside $message = ... with apply_filters( 'the_content', $post->post_content )

$message = apply_filters( 'the_content', $post->post_content ) . ' Written by: ' . $author . ', Link: ' . $permalink;

Remove $post = get_post( $post_id );

Add $post as a function argument.

In the final version below I have made the changes I listed above however I haven't made any attempt to cleanup your code. Here's the full version:

<?php

// Function that runs when a post is published
function run_when_post_published( $post ) {
    $author = get_userdata($post->post_author);
    $category = get_the_category();
    $author_id = $post->post_author;
    $author = get_the_author_meta( 'nickname', $author_id ); 
    $title = get_the_title();
    $permalink = get_permalink();

    $email_subject = '(' . $category[0]->cat_name . ') Case fra kundelogg: ' . $title;
    $message = apply_filters( 'the_content', $post->post_content ) . 'Written by: ' . $author . ', Link: ' . $permalink;
    $headers = 'From: CRM System <mail@mail.com>';

    // Advanced custom field to check if post is supposed to be mailed or not
    if( !empty($_POST['fields']['field_52fc8615d3526'] ) ) {

        $email = 'myemail@mycompany.com';
        wp_mail( $email, $email_subject, $message );

    }
}