how to take specific value from sql array result and use it as a parameter in another sql statement in php

Question

i need some help ,please. i have a sql statment that gives array of result

$query = "SELECT * FROM chat_messages WHERE sender_email='".$user_id."' OR receiver_email='".$user_id."' ORDER BY date_time DESC";

and its result like that

:[
    {"id":"47","sender_email":"amalkronz@hotmail.com","receiver_email":"test@test.com","message":"hee","date_time":"1456320044336"},
    {"id":"46","sender_email":"amalkronz@hotmail.com","receiver_email":"amalkronz@gmail.com","message":"hello","date_time":"1456319938285"},
    {"id":"45","sender_email":"amalkronz@hotmail.com","receiver_email":"amalkronz@gmail.com","message":"hi","date_time":"1456319929258"}
]

and i want to take the "sender_email" from each row and use it in another sql statement to get the user profile details and the same with the "receiver_email" how i can do that to get json response like that :

{ "success":true,"messages":[
      {"id":"156","sender_email":"sescooo@gmail.com","receiver_email":"jmaelagha@gmail.com","message":"hi","date_time":"1448660829608","sender":{"username":"test","img":"http:\/\/orchidatech.com\/sharearide\/images\/default_image.jpg","Gender":"","phone":"0049704197602","email":"sescooo@gmail.com","id":"101"},"receiver":{"username":"jmaagha agha","img":"https:\/\/lh5.googleusercontent.com\/-Ug34apPklis\/AAAAAAAAAAI\/AAAAAAAAAD0\/QUjGOKH0qsU\/photo.jpg?sz=50","Gender":"","phone":"0595114000","email":"jmaelagha@gmail.com","id":"98"}},
      {"id":"155","sender_email":"jma@gmail.com","receiver_email":"seo@gmail.com","message":"hi","date_time":"1448660780012","sender":{"username":"jmaagha agha","img":"https:photo.jpgsz=50","Gender":"","phone":"0595114000","email":"jma@gmail.com","id":"98"},"receiver":{"username":"test","img":"http:default_image.jpg","Gender":"","phone":"0049704197602","email":"seo@gmail.com","id":"101"}},
      {"id":"154","sender_email":"jma@gmail.com","receiver_email":"seo@gmail.com","message":"hi ahmed","date_time":"1448660747317","sender":{"username":"jma agha","img":"https:photo.jpg?sz=50","Gender":"","phone":"0595114000","email":"jma@gmail.com","id":"98"},"receiver":{"username":"test","img":"http:default_image.jpg","Gender":"","phone":"0049704197602","email":"seo@gmail.com","id":"101"}}
    ]
}

PS: the server doesn't support the mysqli fetch_all() thanks

Answer 1

You must loop over a query result that contains multiple rows. Take this example:

$mysqli->query("SELECT * FROM `sometable`"); //multiple rows returned
$savedValues = array();
while($nextRow = $mysqli->fetch_assoc()){
    $someValue = $nextRow['YourEmail_Column_name'];
    array_push($savedValues, $someValue);
}

$len = count($savedValues);
for($i = 0; $i < $len; $i++){
    $newQuery = "SELECT * FROM `someothertable` WHERE `email` = '$savedValues[$i]'";
    $mysqli->query($newQuery);
    $result = $mysqli->fetch_assoc(); //here is your row.  repeat above step for multiple rows!
}

Hope this helps you out!

PS: This could take up lots of memory in PHP, to solve this, perhaps use slimmer mysql statements based on conditions that you know will be true (or false).