Question

我想获得一个值，但它会出现两次：

<?php

    session_start();
    $username = $_SESSION['user'];
    include 'connect.php';
    if (isset($_GET['var'])) {
        $var = $_GET['var'];
        echo "<br>";
        echo $var;
        $pieces = explode(",", $var);

        foreach ($pieces as $i) {
            $sql    = "SELECT title FROM interests WHERE id = '$i' ";
            $result = mysqli_query($con, $sql);
            $row    = mysqli_fetch_array($result);
        }
        $value = join(",", $row);

    }
    echo $username;
    echo $value;

?>

它出现为：result, result;它应该只作为1结果而不重复

Answer 1

mysqli_fetch_array同时返回数字索引和关联数组。这意味着您可以获得同一数组中每个字段的两个副本（一个用数字索引，一个用名称索引）。将对此的调用更改为仅获取关联数组：

$row    = mysqli_fetch_array($result, MYSQLI_ASSOC);

关于下面评论中讨论的第二个问题，请尝试以下方法：

        $titles = [];
        foreach ($pieces as $i) {
            $sql    = "SELECT title FROM interests WHERE id = '$i' ";
            $result = mysqli_query($con, $sql);
            $row    = mysqli_fetch_array($result, MYSQLI_ASSOC);
            $titles[] = $row["title"];
        }
        $value = join(",", $titles);

价值出现两次 - PHP

1 个答案: