What knowledge or skills are necessary to implement updating multiple rows in a SQL table using PHP loops?

To update multiple rows in a SQL table using PHP loops, you need to have knowledge of SQL UPDATE statements and PHP loops. You will need to connect to the database, fetch the rows you want to update, loop through them, and execute an UPDATE query for each row. 

<?php
// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Fetch the rows you want to update
$sql = "SELECT id, column1, column2 FROM your_table WHERE condition = 'value'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Loop through the rows and update them
    while($row = $result->fetch_assoc()) {
        $id = $row['id'];
        $new_value = // calculate the new value here
        
        // Update the row
        $update_sql = "UPDATE your_table SET column1 = '$new_value' WHERE id = $id";
        $conn->query($update_sql);
    }
} else {
    echo "0 results found";
}

$conn->close();
?>

Keywords

PHP SQL loops multiple rows updating

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