This is a PHP script that queries a database using the SQL statement stored in the `$sql` variable. Here's a step-by-step explanation: 1. `$result = $conn-query($sql);` - This line executes the SQL query stored in the `$sql` variable using the database connection `$conn`. The result of the query is stored in the `$result` variable. 2. `if ($result) {...}` - This block of code checks if the query was successful. If it was, it proceeds to the next block of code. 3. `if ($result-num_rows 0) {...}` - This block of code checks if the query returned any rows. If it did, it proceeds to the next block of code. 4. `$medications = array();` - This line initializes an empty array to store the rows returned by the query. 5. `while ($row = $result-fetch_assoc()) {...}` - This loop fetches each row returned by the query one by one until there are no more rows left. 6. `$price = floatval($row["C"]);` - This line converts the value in the "C" column of the current row to a float and stores it in the `$price` variable. 7. `if ($price error;` - If the query was not successful, this line outputs a message saying "Error executing the query:" followed by the error message from the database connection.

Question

This is a PHP script that queries a database using the SQL statement stored in the `$sql` variable. Here's a step-by-step explanation:

1. `$result = $conn->query($sql);` - This line executes the SQL query stored in the `$sql` variable using the database connection `$conn`. The result of the query is stored in the `$result` variable.

2. `if ($result) {...}` - This block of code checks if the query was successful. If it was, it proceeds to the next block of code.

3. `if ($result->num_rows > 0) {...}` - This block of code checks if the query returned any rows. If it did, it proceeds to the next block of code.

4. `$medications = array();` - This line initializes an empty array to store the rows returned by the query.

5. `while ($row = $result->fetch_assoc()) {...}` - This loop fetches each row returned by the query one by one until there are no more rows left.

6. `$price = floatval($row["C"]);` - This line converts the value in the "C" column of the current row to a float and stores it in the `$price` variable.

7. `if ($price < $lowestPrice) {...}` - This block of code checks if the price of the current medication is lower than the lowest price found so far. If it is, it updates the `$lowestPrice` variable and stores the entire row in the `$cheapestMedication` variable.

8. `$medications[] = $row;` - This line adds the current row to the `$medications` array.

9. `echo "No results found.";` - If the query did not return any rows, this line outputs a message saying "No results found."

10. `echo "Error executing the query: " . $conn->error;` - If the query was not successful, this line outputs a message saying "Error executing the query:" followed by the error message from the database connection.

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