PHP improve data retrieving - php

Question

I am retrieving 5000 plus data in my MYSQL database. I takes 5-10 minutes to retrieve the data (it is only just local slower when over the network) is there a way to improve the speed without using a plugin?
$ContactID = $_GET["Contact"];
$sql = "SELECT * FROM tblContacts WHERE Coordinator = '$ContactID'";
$result = mysqli_query($conn, $sql);
$count = mysqli_num_rows($result);
if($count > 0){
while ($row = mysqli_fetch_array($result)) {
$supdate = date("Y-m-d h:i", strtotime($row['ServerUpdate']));
$mupdate = date("Y-m-d h:i", strtotime($row['MobileUpdate']));
$ar[] = array(
'ContactID' => $row['ContactID'],
'FileAs' => $row['FileAs'],
'FirstName' => $row['FirstName'],
'MiddleName' => $row['MiddleName'],
'LastName' => $row['LastName'],
'Position' => $row['Position'],
'Company' => $row['Company'],
'CompanyID' => $row['CompanyID'],
'ContactType' => $row['ContactType'],
'RetailerType' => $row['RetailerType'],
'PresStreet' => $row['PresStreet'],
'PresBarangay' => $row['PresBarangay'],
'PresDistrict' => $row['PresDistrict'],
'PresTown' => $row['PresTown'],
'PresProvince' => $row['PresProvince'],
'PresCountry' => $row['PresCountry'],
'Landmark' => $row['Landmark'],
'Telephone1' => $row['Telephone1'],
'Telephone2' => $row['Telephone2'],
'Mobile' => $row['Mobile'],
'Email' => $row['Email'],
'Employee' => $row['Employee'],
'Customer' => $row['Customer'],
'Coordinator' => $row['Coordinator'],
'ServerUpdate' => $supdate,
'MobileUpdate' => $mupdate
);
}
print json_encode($ar);
}

Answer 1

$ContactID = $_GET["Contact"];
$ar = array();
$sql = "SELECT ContactID,FileAs, FirstName ,MiddleName ,LastName ,Position ,Company ,CompanyID ,ContactType ,RetailerType ,PresStreet
,PresBarangay ,PresDistrict ,PresTown , PresProvince ,PresCountry ,Landmark ,Telephone1 , Telephone2 ,Mobile
,Email ,Employee ,Customer ,Coordinator FROM tblContacts WHERE Coordinator = '$ContactID'";
$result = mysqli_query($conn, $sql);
$count = mysqli_num_rows($result);
if($count > 0){
$rowCount = 0;
while ($row = mysqli_fetch_array($result)) {
$supdate = date("Y-m-d h:i", strtotime($row['ServerUpdate']));
$mupdate = date("Y-m-d h:i", strtotime($row['MobileUpdate']));
$ar[$rowCount] = $row;
$ar[$rowCount]['ServerUpdate'] = $supdate;
$ar[$rowCount]['ServerUpdate'] = $mupdate;
$rowCount++;
}
print json_encode($ar);
}
You must declare the variable of array first in the top.
You can directly call from mysql what data needed. Hope can help.

Answer 2

It could be like this way.
$contactID = $_GET["Contact"];
$sql = "SELECT * FROM tblContacts WHERE Coordinator = '$contactID'";
$result = mysqli_query($conn, $sql);
if(mysqli_num_rows($result) > 0){
$data = array();
while($row = mysqli_fetch_array($result)){
$row['supdate'] = date("Y-m-d h:i", strtotime($row['ServerUpdate']));
$row['supdate'] = date("Y-m-d h:i", strtotime($row['MobileUpdate']));
$data[] = $row;
}
print json_encode($data);
}
updated for multiple records