PHP：帶引號的評論回復系統。 如何顯示父級（引用）消息給子級（答復）消息

Question

如何顯示父級（引用）消息給子級（答復）消息

Database structure:
post_id
comment_id
message
parent_id


SQL data:
post_id: 1
comment_id: 10
message: boohooo
parent_id: 0
------------------
post_id: 1
comment_id: 20
message: another reply
parent_id: 0
------------------
post_id: 1
comment_id: 30
messsage: you are scary
parent_id: 10

這是下面的代碼（從mysql結果轉換為php）到目前為止我所擁有的

<?php 
$first_comment = new stdClass;
$first_comment->cid = '1';
$first_comment->message = 'this is the first message';
$first_comment->parent = '0';

$second_comment = new stdClass;
$second_comment->cid = '20';
$second_comment->message = 'this is the second message';
$second_comment->parent = '0';

$third_comment = new stdClass;
$third_comment->cid = '30';
$third_comment->message = 'this is a reply to the first message';
$third_comment->parent = '10';

$comments = array ($first_comment, $second_comment, $third_comment);

//print_r($comments);

foreach ( $comments as $c ) {
echo "#". $c->cid . "  ". $c->message . "\n\n";
}
?>

在此php沙箱網站上可以擺弄相同的代碼： http : //ideone.com/fwHUwv

我希望這樣輸出：

評論：

＃10。 噓聲
＃20。 另一個答復
＃30。 你很嚇人

Answer 1

<?php 
$first_comment = new stdClass;
$first_comment->cid = '1';
$first_comment->message = 'this is the first message';
$first_comment->parent = '0';

$second_comment = new stdClass;
$second_comment->cid = '2';
$second_comment->message = 'this is the second message';
$second_comment->parent = '0';

$third_comment = new stdClass;
$third_comment->cid = '3';
$third_comment->message = 'this is a reply to the first message';
$third_comment->parent = '1';

$comments = array ($first_comment, $second_comment, $third_comment);

//print_r($comments);

foreach ( $comments as $c ) {
    if($c->parent != 0) { echo "#". $c->cid . "  ". $comments[$c->parent-1]->message . "\n"; echo $c->message; } 
    else {
        echo "#". $c->cid . "  ". $c->message . "\n\n";
    }
}
?>

輸出：

#1  this is the first message

#2  this is the second message

#3  this is the first message
this is a reply to the first message