How can PHP beginners ensure that they correctly set and update a sum variable for column-wise calculations in a table display scenario?

To correctly set and update a sum variable for column-wise calculations in a table display scenario, beginners should initialize the sum variable outside the loop, then add the current value of the column to the sum variable inside the loop for each row. Finally, display the sum variable after the loop to show the total sum of the column. 

<?php
// Initialize sum variable
$sum = 0;

// Loop through the rows of the table
foreach($tableData as $row){
    // Add the current value of the column to the sum variable
    $sum += $row['column_name'];
    // Display the row data
    echo "<tr><td>".$row['column_name']."</td></tr>";
}

// Display the total sum of the column
echo "Total: ".$sum;
?>

Keywords

PHP variable sum column-wise table display

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