Php, dakikayı saniyeye çevirmek

<?php
$total = db::count('video');
$maxpage = ceil($total / $vidsay);
if( !is_numeric($page) || $page < 1 || $page > $maxpage ){
    $page = 1;
}
    
header("Content-type: text/xml");

?>
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:video="http://www.google.com/schemas/sitemap-video/1.1"><?php
$videos = db::get('video', null, null, ['order' => 'id ASC', 'limit' => $vidsay, 'page' => $page, 'select' => 'id, slug, resim, baslik, aciklama, tarih, goruntulenme, sure']);
if( $videos ){
    foreach ($videos as $video) {
?>
<url>
<loc><?=SITE . '/ytbvideo/' . $video->slug?>/</loc>
<video:video>
<video:thumbnail_loc><?=SITE . '/video/' . $video->resim?></video:thumbnail_loc>
<video:title><![CDATA[<?=$video->baslik?>]]></video:title>
<video:description><![CDATA[<?=$video->aciklama?>]]></video:description>
<video:duration></video:duration>
<video:rating>4.2</video:rating>
<video:view_count><?=number_format($video->goruntulenme, 0)?></video:view_count>
<video:publication_date><?=date('Y-m-d\TH:i:sP', strtotime($video->tarih))?></video:publication_date>
</video:video>
</url>
<?php
    }
}
?>
</urlset>

<?php
$total = db::count('video');
$maxpage = ceil($total / $vidsay);
if( !is_numeric($page) || $page < 1 || $page > $maxpage ){
    $page = 1;
}
    
header("Content-type: text/xml");

?>
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:video="http://www.google.com/schemas/sitemap-video/1.1"><?php
$videos = db::get('video', null, null, ['order' => 'id ASC', 'limit' => $vidsay, 'page' => $page, 'select' => 'id, slug, resim, baslik, aciklama, tarih, goruntulenme, sure']);
if( $videos ){
    foreach ($videos as $video) {
?>
<url>
<loc><?=SITE . '/ytbvideo/' . $video->slug?>/</loc>
<video:video>
<video:thumbnail_loc><?=SITE . '/video/' . $video->resim?></video:thumbnail_loc>
<video:title><![CDATA[<?=$video->baslik?>]]></video:title>
<video:description><![CDATA[<?=$video->aciklama?>]]></video:description>
<video:duration><?php
list($dakika, $saniye) = explode(':', $video->sure);
$sure = ($dakika * 60) + $saniye;
echo $sure;
?></video:duration>
<video:rating>4.2</video:rating>
<video:view_count><?=number_format($video->goruntulenme, 0)?></video:view_count>
<video:publication_date><?=date('Y-m-d\TH:i:sP', strtotime($video->tarih))?></video:publication_date>
</video:video>
</url>
<?php
    }
}
?>
</urlset>