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get_post_meta在functions.php中的函数内部不起作用，但在外部起作用

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function notify_new_posts($post_id) {$keyval = get_post_meta( $post_id); $buyer_wdistance= get_post_meta( $post_id, 'cf_wdrive'); //$buyer_wdistance=$keyval['cf_wdrive'][0]; $buyer_location=$keyval['cf_address'][0]." , ".$keyval['cf_zipcode'][0]; //$buyer_location= '3302 23rd street, astoria, ny'; //$buyer_wdistance= '10'; $post= get_post($post_id); $author= get_userdata($post-> post_author); $author_email= $author-> user_email; $email_subject = " New car request posted "; $blogusers = get_users( 'blog_id=1& orderby=nicename& role=dealership' ); foreach ( $blogusers as $user ) {$target_email=$user-> user_email; $current .= " targetemail: ".$target_email ." | " ; $dealer_location = get_usermeta($user-> id, 'company_name')." , ".get_usermeta($user-> id, 'rep_name') ; $current .= " dealerlocation: ".$dealer_location . " | " ; $from = $buyer_location; //echo "< br> "; $to= $dealer_location; $from = urlencode($from); $to= urlencode($to); $data = http://www.srcmini.com/file_get_contents("http://maps.googleapis.com/maps/api/distancematrix/json?origins=$from& destinations=$to& language=en-EN& sensor=false"); $data = http://www.srcmini.com/json_decode($data); $time= 0; $distance = 0; foreach($data-> rows[0]-> elements as $road) { $time += $road-> duration-> value; $distance += $road-> distance-> value; }$distance = round($distance*0.000621371); $time = round($time/60); //echo"distance to this dealer in miles ".$distance."< br> "; $current .= " distance: ".$distance . " | " ; if ($distance< = $buyer_wdistance ){ob_start(); ?> < html> < head> < title> New post at < ?php bloginfo( 'name' ) ?> < /title> < /head> < body> < p> Hello < ?php echo $author-> user_firstname ?> , < /p> < p> A new lead was posted: < a href="http://www.srcmini.com/< ?php echo get_permalink($post-> ID) ?>"> < ?php the_title_attribute() ?> < /a> .< /p> < /body> < /html> < ?php$message = ob_get_contents(); ob_end_clean(); wp_mail( $target_email, $email_subject, $message ); } //end of if statememnt}$file = 'people.txt'; // Open the file to get existing content //$current = file_get_contents($file); // Append a new person to the file$current .= " postid: ".$post_id." | " ; $current .= " author: ".$post-> post_author. " | " ; $current .= " author_email ".$author_email. " | " ; $current .= " buyerlocation: ".$buyer_location.$buyer_wdistance. " | " ; $current .= " buyerwdistance: ".$buyer_wdistance . " | " ; // Write the contents back to the file file_put_contents($file, $current); }add_action( 'publish_post', 'notify_new_posts', 10, 2 );

【get_post_meta在functions.php中的函数内部不起作用，但在外部起作用】这是我在functions.php中的函数的开头(是现在, 根据帮助程序的请求现在是完整的代码), 我发疯了, 因为如果我使用相同的get_post_meta OUTSIDE函数INSIDE functions.php => , 只要我能正常使用传递正确的帖子ID。但是一旦它在被钩住的函数内部(是的, 有一个钩子, 其余的都可以正常工作), 它就不会返回值。请帮忙
#1你可能需要将$ post以及$ post_id传递给函数。尝试将第一行更改为：
function notify_new_posts( $post_id, $post ) {

参考：http://codex.wordpress.org/Plugin_API/Action_Reference/publish_post
#2使用全局$ post;
例如：
function notify_new_posts($post_id) { global $post;

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