How can SQL statements be debugged and tested effectively to ensure accurate data retrieval in PHP scripts?

To debug and test SQL statements effectively in PHP scripts, you can use error handling functions like `mysqli_error()` to catch any syntax errors or issues with the SQL query. Additionally, you can print out the SQL query before executing it to ensure it is constructed correctly. Testing the SQL query directly in a SQL client tool can also help identify any issues with the query before integrating it into the PHP script. 

// Example of debugging and testing SQL statements in PHP
$sql = "SELECT * FROM users WHERE id = 1";
$result = mysqli_query($conn, $sql);

if(!$result) {
    echo "Error: " . mysqli_error($conn);
} else {
    // Fetch and display results
    while($row = mysqli_fetch_assoc($result)) {
        echo "User ID: " . $row['id'] . " | Name: " . $row['name'];
    }
}

mysqli_close($conn);

Keywords

SQL debugging testing data retrieval PHP scripts accuracy

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