php - 使用 MySqli 和数组返回多行

Question

在过去两天左右的时间里，我一直在将我的函数转换为 mysqli。我遇到了一个问题。我有一个函数，它返回一个包含数据库中一行的数组。但是，我希望数组包含多行而不是一行。此外，我将如何回应各个帖子。这是我失败的尝试，仅在数组中显示一行。

$mysqli = new mysqli("localhost", "user", "password", "database");   

function display_posts ($mysqli, $user_id) {

   $fields = "`primary_id`, `poster_id`, `profile_user_id`, `post`";   

   $user_id = (int)$user_id;

   $query = "SELECT DISTINCT $fields FROM `posts` WHERE `profile_user_id` = $user_id 
   LIMIT 4";                    

   if ($result = $mysqli->query($query)) {

   $row = $result->fetch_assoc();

   return $row;

   $result->free();

   $stmt->close();

}}

在这里，我试图显示数据。

$user_id = 1;

$posts = display_posts($mysqli, $user_id);

//Not sure what to do with $posts. A While loop perhaps to display each post?

Answer 1

你必须使用一个循环来一次得到它们：

<?php
function resultToArray($result) {
    $rows = array();
    while($row = $result->fetch_assoc()) {
        $rows[] = $row;
    }
    return $rows;
}

// Usage
$query = 'SELECT DISTINCT $fields FROM `posts` WHERE `profile_user_id` = $user_id LIMIT 4';
$result = $mysqli->query($query);
$rows = resultToArray($result);
var_dump($rows); // Array of rows
$result->free();

Answer 2

为什么不直接这样使用：

$result = mysqli_fetch_all($mysqli->query($query), MYSQLI_ASSOC);

Answer 3

我迟到了，但我相信这是您想要实现的目标：

$mysqli = new mysqli("localhost", "user", "password", "database");
$fields = "`primary_id`, `poster_id`, `profile_user_id`, `post`";

function display_posts () {

    global $mysqli;
    global $fields;

    $query = "SELECT DISTINCT $fields FROM `posts` WHERE `profile_user_id` = $user_id LIMIT 4";

    $posts = $mysqli -> query($query) or die('Error: '.$mysqli -> error);

    if ($posts -> num_rows > 0) {

        while ($row = $posts -> fetch_assoc()) {

        $value = $row['/*The table column here (You can repeat this line with a different variable e.g. $value 2, $value 3 etc and matching them with the respective table column)*/'];

        echo $value./*Concatenate the other variables ($value 1 etc) here*/'<br />';

        }

    }else {

        echo 'No records found.';

    }

}

//Call the function
display_posts ();