Remove foreach last comma PHP [duplicate]

Answer 1

I would just take a functional approach:

<?php
$result = $sth->fetchAll();
echo implode(',', array_column($result, 'length'));

Note that array_column() requires PHP 5.5+.

Answer 2

One way to solve this is to not echo out the commas in the foreach loop. Put the data you want to echo into an array, then use implode.

$output = array();
foreach($result as $r) {
    $output[] = $r['lenght'];
}

echo implode(',', $output);