Simple script to convert Page field to Pagetable

pf2pt.php

<?php

include("index.php");

$pages = wire()->pages;

$stadiums = $pages->find("template=template, field.count>0");

$ptf = "template"; 
$ptt = "fieldname"; 
$name = "name";

foreach($stadiums as $stadium)
{
    $count = 0;
    foreach($stadium->architect as $architect)
    {
        $count++;
        $npt = new Page();
        $npt->of(false);
        $npt->name = $name . "-" . $count;
        $npt->template = $ptt;
        $npt->parent = $stadium;
        $npt->architect = $architect;
        $npt->save();
    }

    $stadium->of(false);
    $stadium->$ptf->add($npt);
    $stadium->save();

}