How can PHP developers handle empty result sets from SQL queries to prevent errors in their scripts?

When handling empty result sets from SQL queries in PHP, developers can prevent errors by checking if there are rows returned before trying to access the data. This can be done by using functions like `mysqli_num_rows()` or `rowCount()` to determine if there are results to process. If the result set is empty, developers can handle it by displaying a message or taking appropriate action in their script. 

// Perform SQL query
$result = mysqli_query($conn, "SELECT * FROM table WHERE condition");

// Check if there are rows returned
if(mysqli_num_rows($result) > 0) {
    // Process the results
    while($row = mysqli_fetch_assoc($result)) {
        // Do something with the data
    }
} else {
    // Handle empty result set
    echo "No results found.";
}

Keywords

PHP SQL queries error handling empty result sets data validation

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