Commands out of sync in A correct code - php

Question

I've the following query executed via PHP, it used to work like yesterday, and stopped working today, here's it :
SELECT
*,
(SELECT IF (pro.uid= '4342','True','False') FROM pro) AS 'uid'
FROM
Episodes, pro
ORDER BY
Episodes.id DESC
LIMIT 9
The '4342' is changed with GET param, I'm having the following error :
Commands out of sync; you can't run this command now
My PHP API is as the following ( snippets ) :
<?php
include_once "db_config.php";
DEFINE ('DB_HOST', $host);
DEFINE ('DB_USER', $user);
DEFINE ('DB_PASSWORD', $pass);
DEFINE ('DB_NAME', $database);
$mysqli = #($GLOBALS["___mysqli_ston"] = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD)) OR die ('Could not connect to MySQL');
#((bool)mysqli_query($GLOBALS["___mysqli_ston"], "USE " . constant('DB_NAME'))) OR die ('Could not select the database');
?>
<?php
if(isset($_GET['meaE'], $_GET['uid']))
{
$query="SELECT * , (SELECT IF (pro.uid= '".$_GET['uid']."','True','False') FROM pro ) AS 'uid' FROM Episodes,pro ORDER BY Episodes.id DESC LIMIT 9
";
$resouter = mysqli_query($GLOBALS["___mysqli_ston"], $query);
}
$set = array();
$total_records = mysqli_num_rows($resouter);
if($total_records >= 1){
while ($link = mysqli_fetch_array($resouter, MYSQLI_ASSOC)){
$set['APITest'][] = $link;
}
}
echo $val= str_replace('\\/', '/', json_encode($set));
?>
I want to have the following output :
TABLE A - TABLE B
ID NAME TEXT UID - Check_ID
The query I want :
Select * From Table A, Check if "134123123" is exists in B, if yes / no add a record for all the taken records from Table A with the value of checking (True/False) .
What's happening with #sagi query is :
There are 3 records in Table B, and 10 records in Table A, when the query is executed, the result is 30 records, each record in Table B has 10 records from Table A, and the "uid" record value is True where the uid is '134123123', and it's false where it's not '134123123' .

Answer 1

Your query seems wrong, I don't know how it worked yesterday, but right now your are cross joining with out a condition (could be correct but I doubt it) - that means each record in episodes will be joined to each record in pro . In addition, your subquery with the IF will return more then 1 record unless this table contains only 1 record (which again - I doubt it) .
Try this:
SELECT distinct t.*, IF (s.uid is null,'True','False') AS 'uid'
FROM Episodes t
Left JOIN pro s
ON(s.uid = '4342')
ORDER BY t.id DESC
LIMIT ?????
Try using a sub query instead of a join:
Select t.*,
Case when exists(select 1 from pro s where s.uid = '4342')
Then 'true' else 'false'
End as 'uid'
From episodes t
Order by t.id desc
Limit 9;