Try this, it edits the iframe tag with PHP
<?php
$html = get_field('video');
$dom = new DOMDocument;
$dom->loadHTML($html);
foreach ($dom->getElementsByTagName('iframe') as $item) {
$src = $item->getAttribute('src');
$srcEx = explode('video/', $src);
$item->setAttribute('id', 'v-' . $srcEx[1]);
$item->setAttribute('src', $item->getAttribute('src') . '?api=1&player_id=v-' . $srcEx[1]);
print $dom->saveHTML();
}
?>
You can obviously change the way you assign the ID 😉
