Combining results of multiple if statements in php - php

Question

I have a php file with two mysql queries and an if statement for each query. I'd like the final output to combine the two results and separate with a comma. Right now, the first if statement is working, but the second is not.
$result = mysql_query("SELECT round(AVG(cop),1) AS 'avg_cop' FROM table WHERE timestamp >= subdate((select max(timestamp) from table), interval 1 week)");
if ($result < 3.41)
{
$ret = "example text 1";
} else {
$ret = "na";
}
$result1 = mysql_query("SELECT round(AVG(temp),1) AS 'avg_temp' FROM table WHERE timestamp >= subdate((select max(timestamp) from table), interval 1 week)");
if ($result1 < 53)
{
$ret1 = "example text 2";
} else {
$ret1 = "na";
}
echo $ret.", ".$ret1;
In this instance, I know that the first query results in a "1.1" value and the second results in a "69.4" value. But, the final result I get is "example text 1, example text 2" when it should be "example text 1, na". Any ideas on what I'm doing wrong?

Answer 1

mysql_query doesn't return the row itself, it returns a resource that you need to pass into a function like mysql_fetch_array() or mysql_fetch_assoc() to deal with the table result; you can't just simply use the return value from mysql_query.
It would also probably be better if you just combined the SQL queries into one.
$result = mysql_query("SELECT round(AVG(cop),1) AS 'avg_cop', round(AVG(temp),1) AS 'avg_temp' FROM table WHERE timestamp >= subdate((select max(timestamp) from table), interval 1 week)");
$row = mysql_fetch_assoc($result);
if ($row['avg_cop'] < 3.41)
{
$ret = "example text 1";
} else {
$ret = "na";
}
if ($row['avg_temp'] < 53)
{
$ret1 = "example text 2";
} else {
$ret1 = "na";
}
echo $ret.", ".$ret1;

Answer 2

$result and $result1 are currently strings. You want to add:
$result = mysql_query("SELECT ... // unchanged");
$result = floatval($result)
if ($result < 3.41)
and for $result1
$result1 = mysql_query("SELECT ... // unchanged");
$result1 = floatval($result1)
if ($result1 < 53.0) // note the addition of the .0 to compare one float to another

Answer 3

Do not use MYSQL it has deprecated since PHP 5, use MYSQLi or PDO instead; they are much safer a provide you with improved features.
It is also good pratice to assign a null value to a PHP variable before assigning it a value, especially in this case ($ret ="" then you may change the value).
Finally, the results from mysql_query() is a resource, you need to iterate through it to get the proper values:
while ($row = mysql_fetch_assoc($result)):
//Do something with $row['avg_temp'];
endwhile;
Hope this helps!