两个文件的JSON格式错误

Question

我想知道，我刚刚创建了我的数据表，但其中两个给出了JSON格式错误。我在这两个表中连接两个表。我尝试在phpmyadmin中运行查询，它工作得很好，下面是我的服务器端文件的一个示例：

<?php
$username="drup197";
$password="*****";
$database="census";
$server="localhost";

$link = mysqli_connect($server,$username,$password,$database);

//@mysql_select_db($database,$link) or die( "Unable to select database");
$query = "
    SELECT *   
    FROM national_age_gender_demographics INNER JOIN arizona_age_gender_demogrpahics
    WHERE national_age_gender_demographics.age_group = arizona_age_gender_demogrpahics.age_group
    ORDER BY national_age_gender_demographics.index_number";

$result = mysqli_query($link,$query);

if(!$result)  die( "Query: " . $query . "\nError:" . mysql_error() );

//print_r($row);
$tableData = '{"aaData": [[';
$numRows = $result->num_rows;
$row = mysqli_fetch_array($result);

for ($i = 0; $i < $numRows; $i++) {
    if ($i != 0) {
        $tableData .= ",[";
    }
    $tableData .= '"' . $row['age_group'] . '",';
    $tableData .= '"' . $row['national_age_gender_demographics.both_pop'] . '",';
    $tableData .= '"' . $row['national_age_gender_demographics.male_pop'] . '",';
    $tableData .= '"' . $row['national_age_gender_demographics.female_pop'] . '",';
    $tableData .= '"' . $row['national_age_gender_demographics.male_percent'] . '",';
    $tableData .= '"' . $row['national_age_gender_demographics.female_percent'] . '",';
    $tableData .= '"' . $row['national_age_gender_demographics.both_percent'] . '",';
    $tableData .= '"' . $row['national_age_gender_demographics.males_per_100_females'] . '",';
    $tableData .= '"' . $row['arizona_age_gender_demographics.both_pop'] . '",';
    $tableData .= '"' . $row['arizona_age_gender_demographics.male_pop'] . '",';
    $tableData .= '"' . $row['arizona_age_gender_demographics.female_pop'] . '",';
    $tableData .= '"' . $row['arizona_age_gender_demographics.male_percent'] . '",';
    $tableData .= '"' . $row['arizona_age_gender_demographics.female_percent'] . '",';
    $tableData .= '"' . $row['arizona_age_gender_demographics.both_percent'] . '",';
    $tableData .= '"' . $row['arizona_age_gender_demographics.males_per_100_females'] . '"]';
    if ($i != $numRows - 1) {
        $row = mysqli_fetch_array($result);
    }
}
$tableData .= ']}';
echo $tableData;
?>

有人知道这里出了什么问题吗？

Answer 1

首先Steven是对的，最好使用json编码(或者至少更整洁)来创建你的json，把你从混乱的is和支架业务中解救出来。

我还建议使用mysqli_fetch_assoc而不是mysqli_fetch_array，因为您当前指定的as应该同时返回关联和编号结果(请参阅此处的http://php.net/manual/en/mysqli-result.fetch-array.php)，这可能会弄乱您的结果。

例如：

...
$row = mysqli_fetch_assoc($result);
$json_data = json_encode($row);
echo $json_data;
?>

试一试，看看你是怎么做的？