PHP Why If / Else statement not working in While loop? - php

Question

This is my code and I don't know why IF/ELSE statement is not working
$user_id = $_POST['user_id'];
$strSQL = "SELECT chat.user_id,max(date) max_date ,user.user_id,user.firstname,user.lastname,user.picture
FROM ( select from_user_id as user_id,date,isread from chat
WHERE to_user_id = '$user_id'
Union select to_user_id as user_id,date,isread from chat WHERE from_user_id = '$user_id' ) as chat join user on user.user_id = chat.user_id
where user.status != 'block' group by chat.user_id order by max_date DESC";
$chatdata = array();
$objQuery = mysql_query($strSQL);
while($row = mysql_fetch_assoc($objQuery)){
$frduser_id = $row['user_id'];
$firstname = $row['firstname'];
$lastname = $row['lastname'];
$picture = $row['picture'];
$strSQL2 = "SELECT isread from chat WHERE to_user_id = '$user_id' and from_user_id = '$frduser_id'
ORDER BY date DESC LIMIT 1";
//array_push($chatdata, $row);
$objQuery2 = mysql_query($strSQL2);
if (empty($objQuery2)) {
$row2 = 1;
$result = array_merge($row, $row2);
array_push($chatdata,$result);
}else{
$row2 = mysql_fetch_assoc($objQuery2);
$result = array_merge($row, $row2);
array_push($chatdata,$result);
}
}

Answer 1

You can use mysql_num_rows to get count of rows inside results.
$objQuery2 = mysql_query($strSQL2);
$objQuery2Rows = mysql_num_rows($strSQL2);
if ( $objQuery2Rows < 1) {
$row2 = 1;
$result = array_merge($row, $row2);
array_push($chatdata,$result);
}else{
$row2 = mysql_fetch_assoc($objQuery2);
$result = array_merge($row, $row2);
array_push($chatdata,$result);
}