无法使用PHP将blob透明图像导入json

Question

if (function_exists($_GET['displayResult']))
    displayResult();

function displayResult() {
    $db = new PDO('sqlite:ROS.sqlite');
    $sql = 'select * from Item_Image_Large';
    $result = $db->query($sql);
    $rows[] = array();
    while ($row = $result->fetchObject()) {
        $rows['Item_Image_Large'][] = $row;
        foreach ($rows as $key => $value) {
            $newArrData[$key] = $rows[$key];
            $newArrData[$key]['image_large'] = base64_encode($rows[$key]['image_large']);
        }
    }

    header('Content-type: image/png');
    $result2 = json_encode($newArrData);
    echo $result2;
}

This code is used for get BLOB data from database and try to convert it into JSON format but it doesn't work. The BLOB data is in PNG format.

Answer 1

change

header('Content-type: image/png');

to

header('Content-Type: application/json');