Структура набора данных JSON

Я просто изменяю ваш код, пробую этот код, надеюсь, вы получите ожидаемый результат.

<?php
header('Content-type: application/json');
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "couponsdeals";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}

$apikey = $_GET['API_KEY'];
$sql = "SELECT  AFF_ID FROM api WHERE API_KEY= '$apikey' ";

//$sql1= "SELECT  ID,Coupon_ID,Campaign_ID,Campaign_Name,Title,Description,Category,Type,Type_Value,Tracking_URL,Added_Date,Expiry_Date FROM couponcode_table ";

$sql1= "SELECT  * FROM couponcode_table ";

$result = $conn->query($sql);

$result1 = $conn->query($sql1);

if ($result) {

// output data of each row

$json = array();while($row = $result->fetch_assoc()) {

$data= $row["AFF_ID"];

if($result1){

while($row1 = $result1->fetch_assoc()) {$data1=$row1["Tracking_URL"];$mydata = explode("&",$data1);if(isset($mydata[2])){

$mydata2= $mydata[0]."&aff_id=".$data."&".$mydata[2];

$values =array(
'ID' => $row1['ID'],
'Coupon_ID' => $row1['Coupon_ID'],
'Campaign_ID' => $row1['Campaign_ID'],
'Campaign_Name' => $row1['Campaign_Name'],
'Title' => $row1['Title'],
'Description' => $row1['Description'],
'Category' => $row1['Category'],
'Type' => $row1['Type'],
'Type_Value' => $row1['Type_Value'],
'Tracking_URL' =>$mydata2,
'Added_Date' => $row1['Added_Date'],
'Expiry_Date' => $row1['Expiry_Date']
);array_push($json, $values);

} else {

$mydata1= $mydata[0]."&aff_id=".$data;

$value =array(
'ID' => $row1['ID'],
'Coupon_ID' => $row1['Coupon_ID'],
'Campaign_ID' => $row1['Campaign_ID'],
'Campaign_Name' => $row1['Campaign_Name'],
'Title' => $row1['Title'],
'Description' => $row1['Description'],
'Category' => $row1['Category'],
'Type' => $row1['Type'],
'Type_Value' => $row1['Type_Value'],
'Tracking_URL' =>$mydata1,
'Added_Date' => $row1['Added_Date'],
'Expiry_Date' => $row1['Expiry_Date']
);

array_push($json, $value);

}

}

}
}

echo json_encode($json, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
}
elseif(!$result) {

echo "0 results";

}

$conn->close();
?>

Если вы намереваетесь получить все данные, сгенерированные в цикле, вам может понадобиться просто сохранить все данные в переменной и отличить выходные данные echo $whatever; до конца вашего сценария и за пределами цикла. Таким образом, вы обязательно соберете все свои данные за один раз … Слегка измененные и прокомментированные ваш код ниже иллюстрирует все это лучше

    <?php
header('Content-type: application/json');
$servername     = "localhost";
$username       = "root";
$password       = "";
$dbname         = "couponsdeals";

// CREATE A VARIABLE THAT WOULD HOLD ALL THE DATA (ARRAY GENERATED IN THE LOOP)
// INITIALIZE IT TO THE DEFAULT "FAILURE" MESSAGE..."0 Results"// THAT WAY; YOU WOULDN'T NEED ANY else if() CLAUSE...
$jsonData       = array("message"=> "0 results");

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}

$apikey     = $_GET['API_KEY'];
$sql        = "SELECT  AFF_ID FROM api WHERE API_KEY= '$apikey' ";
$sql1       = "SELECT  * FROM couponcode_table ";
$result     = $conn->query($sql);
$result1    = $conn->query($sql1);
$json       = array();
$json1      = array();

if ($result) {
// output data of each row
while($row  = $result->fetch_assoc()) {
$data   = $row["AFF_ID"];
if($result1){
while($row1 = $result1->fetch_assoc()) {
$data1  = $row1["Tracking_URL"];
$mydata = explode("&",$data1);

if(isset($mydata[2])){
$json1      = array();
$mydata2    = $mydata[0]."&aff_id=".$data."&".$mydata[2];
$values     = array(
'ID'            => $row1['ID'],
'Coupon_ID'     => $row1['Coupon_ID'],
'Campaign_ID'   => $row1['Campaign_ID'],
'Campaign_Name' => $row1['Campaign_Name'],
'Title'         => $row1['Title'],
'Description'   => $row1['Description'],
'Category'      => $row1['Category'],
'Type'          => $row1['Type'],
'Type_Value'    => $row1['Type_Value'],
'Tracking_URL'  => $mydata2,
'Added_Date'    => $row1['Added_Date'],
'Expiry_Date'   => $row1['Expiry_Date']
);
// PUSH DATA TO THE $json1 VARIABLE
// AND DO NOT OUTPUT IT HERE YET... DIFFER IT
// TO THE END OF THE SCRIPT.
array_push($json1, $values);

}else{
$json       = array();
$mydata1    = $mydata[0]."&aff_id=".$data;
$value      = array(
'ID'            => $row1['ID'],
'Coupon_ID'     => $row1['Coupon_ID'],
'Campaign_ID'   => $row1['Campaign_ID'],
'Campaign_Name' => $row1['Campaign_Name'],
'Title'         => $row1['Title'],
'Description'   => $row1['Description'],
'Category'      => $row1['Category'],
'Type'          => $row1['Type'],
'Type_Value'    => $row1['Type_Value'],
'Tracking_URL'  => $mydata1,
'Added_Date'    => $row1['Added_Date'],
'Expiry_Date'   => $row1['Expiry_Date']
);
// PUSH DATA TO THE $json VARIABLE
// AND DO NOT OUTPUT IT HERE YET... DIFFER IT
// TO THE END OF THE SCRIPT...
array_push($json, $value);
}
}

}
}
// NOW; OVERRIDE THE $jsonData VARIABLE WE CREATED ABOVE
// AND CREATE 2 ELEMENTS WITHIN IT 'json1' & 'json2'
// TO HOLD THE VALUES GENERATED WITHIN THE IF & ELSE CLAUSE RESPECTIVELY:SET ITS VALUE TO THE $json
$json       = (!empty($json))  ? $json  : array("message"=>"Empty Data-set for json");
$json1      = (!empty($json1)) ? $json1 : array("message"=>"Empty Data-set for json1");

// ASSIGN DATA FROM $json & $json1 TO THE $jsonData ARRAY...
$jsonData   = array(
"json"  => $json,
"json1" => $json1,
);
}
// NO NEED FOR ELSE CLAUSE BECAUSE IF THE "IF CLAUSE" DOES NOT RUN;
// WE HAVE A DEFAULT FOR THE $jsonData WHICH HAS A MESSAGE KEY
// CONTAINING THE DEFAULT MESSAGE WITHIN AN ARRAY...

// CLOSE DB CONNECTION
$conn->close();

// ECHO OUT THE JSON-ENCODED DATA AND EXIT THE SCRIPT USING DIE...
die( json_encode($jsonData, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES) );