Query=>Array=>Output = PHP 警告：非法偏移类型

Question

我尝试selectmysql数据，将它们保存在二维数组中并输出数据。我收到上面提到的每一列和每一行的错误消息。

谁能指出我的错误。我怎样才能让它工作？

这是代码：

// connect database
    $db_connection = new mysqli (MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DB);

    // execute query 
    $query_result = $db_connection->query($sql_career);

    // save carrer data
    while( $row = $query_result->fetch_assoc() )
    {
        $career[]['id'] = $row['career_id'];
        $career[]['season'] = $row['career_season'];
        $career[]['matches'] = $row['career_matches'];
        $career[]['goals'] = $row['career_goals'];
        $career[]['team_name'] = $row['career_team_name'];
    }

    // output
    echo '<table border="1">';
    foreach ($career as $i)
    {
      echo "<tr>";
      echo "<td>". $career[$i]['id'] . "</td>";
      echo "<td>". $career[$i]['season'] . "</td>";
      echo "<td>". $career[$i]['team_name'] . "</td>";
      echo "<td>". $career[$i]['matches'] . "</td>";
      echo "<td>". $career[$i]['goals'] . "</td>";
      echo "</tr>";
    }
    echo "</table>";

Answer 1

只需替换此代码，

您已经使用了 foreach ，它给出了当前数组。

foreach ($career as $i)
    {
      echo "<tr>";
      echo "<td>". $i['id'] . "</td>";
      echo "<td>". $i['season'] . "</td>";
      echo "<td>". $i['team_name'] . "</td>";
      echo "<td>". $i['matches'] . "</td>";
      echo "<td>". $i['goals'] . "</td>";
      echo "</tr>";
    }

Answer 2

你可以试试这个...

while( $row = $query_result->fetch_assoc() )
{
    $career[] = $row;
}

// output
echo '<table border="1">';
foreach ($career as $i)
{
  echo "<tr>";
  echo "<td>". $i['id'] . "</td>";
  echo "<td>". $i['season'] . "</td>";
  echo "<td>". $i['team_name'] . "</td>";
  echo "<td>". $i['matches'] . "</td>";
  echo "<td>". $i['goals'] . "</td>";
  echo "</tr>";
}
echo "</table>";

Answer 3

如果你有一个成功的行查询，那么只需内爆这些行并且只循环一次。

if (!$query_result = $db_connection->query($sql_career)) {
    // check error
} elseif (!$query_result->num_rows) {
    // no rows
} else {
    echo '<table border="1">';

        // I assume you have column headings in mind, add them here

        while($row = $query_result->fetch_assoc()) {
            echo "<tr><td>", implode("</td><td>", $row), "</td></tr>";
        }
    echo "</table>";
}

或者如果您有将结果集存储为多维数组的实际需求，您可以使用Miller's top voted comment in the manual。

for ($set = array (); $row = $query_result->fetch_assoc(); $set[] = $row);

根据上面的 one-liner，您可以像这样应用相同的 "loop and implode" 逻辑：

if (sizeof($set)) {
    echo '<table border="1">';
        foreach ($set as $row) {
            echo "<tr><td>", implode("</td><td>", $row), "</td></tr>";
        }
    echo "</table>";
}

或者你可以全部写出来：

echo '<table border="1">';
    foreach ($set as $row){
        echo "<tr>";
            echo "<td>{$row['career_id']}</td>";
            echo "<td>{$row['career_season']}</td>";
            echo "<td>{$row['career_team_name']}</td>";
            echo "<td>{$row['career_matches']}</td>";
            echo "<td>{$row['career_goals']}</td>";
        echo "</tr>";
    }
echo "</table>";

如果您想提前操作关联键，您可以调整 SELECT 子句，例如：

SELECT career_id AS 'id', career_season as 'season', career_team_name AS 'team_name', career_matches AS 'matches', career_goals AS 'goals' FROM ...

Answer 4

虽然这不是最佳做法，但它确实解决了我最初提出的警告问题。

// save carrer data
$row_counter = 0;
while( $row = $query_result->fetch_assoc() )
{
    $row_counter++;
    $career[$row_counter]['id'] = $row['career_id'];
    $career[$row_counter]['season'] = $row['career_season'];
    $career[$row_counter]['matches'] = $row['career_matches'];
    $career[$row_counter]['goals'] = $row['career_goals'];
    $career[$row_counter]['team_name'] = $row['career_team_name'];
}

// output
echo '<table border="1">';
foreach ($career as $i)
{
  echo "<tr>";
  echo "<td>". $i['id'] . "</td>";
  echo "<td>". $i['season'] . "</td>";
  echo "<td>". $i['team_name'] . "</td>";
  echo "<td>". $i['matches'] . "</td>";
  echo "<td>". $i['goals'] . "</td>";
  echo "</tr>";
}
echo "</table>";

在对@mickmackusa 提案进行进一步测试后，我得出了以下解决方案。输出功能仅供测试。主要重点是准备和提供数据供以后使用。

function get_career($player_id) {

    // sql placeholder to save code here
    $sql_career = "...";

    // connect database
    $db_connection = new mysqli (MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DB);

    if (!$query_result = $db_connection->query($sql_career)) {
        // check error
    } elseif (!$query_result->num_rows) {
        // no rows
    } else {
        for (
            $career = array (); 
            $row = $query_result->fetch_assoc(); 
            $career[] = $row);
    }

    return $career;     

} // function end

function output_career($player_id) {

    // function call, get career data
    $career = get_career($player_id);

    // output
    echo '<table border="1">';
    foreach ($career as $career)
    {
      echo "<tr>";
      echo "<td>". $career['id'] . "</td>";
      echo "<td>". $career['season'] . "</td>";
      echo "<td>". $career['team_id'] . "</td>";
      echo "<td>". $career['team_name'] . "</td>";
      echo "<td>". $career['country_name'] . "</td>";
      echo "<td>". $career['country_abbreviation'] . "</td>";
      echo "<td>". $career['league_name'] . "</td>";
      echo "<td>". $career['matches'] . "</td>";
      echo "<td>". $career['goals'] . "</td>";
      echo "<td>". $career['status_name'] . "</td>";
      echo "</tr>";
    }
    echo "</table>";

} // function end

Query=>Array=>Output = PHP 警告：非法偏移类型

Query=>Array=>Output = PHP Warning: Illegal offset type

php

arrays

warnings

multidimensional-array