How can loops and conditional statements be effectively used in PHP to iterate through database query results and update entries?

To iterate through database query results and update entries in PHP, you can use a loop to go through each row returned by the query and apply conditional statements to determine which entries need to be updated. Inside the loop, you can execute an UPDATE query to make the necessary changes to the database entries. 

<?php

// Connect to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Perform a SELECT query
$query = "SELECT id, name FROM users";
$result = mysqli_query($connection, $query);

// Check if the query returned any results
if(mysqli_num_rows($result) > 0) {
    // Loop through each row
    while($row = mysqli_fetch_assoc($result)) {
        // Apply conditional statements to determine if an entry needs to be updated
        if($row['name'] == "John") {
            // Execute an UPDATE query to update the entry
            $updateQuery = "UPDATE users SET name = 'Jane' WHERE id = " . $row['id'];
            mysqli_query($connection, $updateQuery);
        }
    }
}

// Close the database connection
mysqli_close($connection);

?>

Keywords

PHP loops conditional statements database query entries.

Related Questions