How can PHP developers troubleshoot SQL queries that are not functioning as expected in their code?

To troubleshoot SQL queries that are not functioning as expected in PHP code, developers can use functions like mysqli_error() to display any errors generated by the query. They can also echo the query before executing it to ensure it is constructed correctly. Additionally, developers can use tools like phpMyAdmin to run the query directly on the database to see if it returns the expected results. 

// Example PHP code snippet to troubleshoot SQL queries

// Construct the SQL query
$query = "SELECT * FROM users WHERE id = 1";

// Echo the query to ensure it is correct
echo $query;

// Execute the query
$result = mysqli_query($connection, $query);

// Check for errors
if (!$result) {
    echo "Error: " . mysqli_error($connection);
} else {
    // Process the results
    while ($row = mysqli_fetch_assoc($result)) {
        // Do something with the data
    }
}

// Close the connection
mysqli_close($connection);

Keywords

PHP SQL queries troubleshooting error handling debugging

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