PHP load multiple XML data without numbering

I'm facing some problems trying to load multiple data from an XML file. I want to load all XML data without having to number them [0],[1], etc. how can I accomplish that?

PHP

<?php
  echo"<center>";
  $xml = simplexml_load_file('channels.xml') or die('Failed to read data');
  echo $xml->channels[0]->name . "<br>";
  echo "<img class='responsive' src='";
  echo $xml->channels[0]->banner;
  echo "'><br>";
  echo "<form method='post' action='index.php'>";
  echo "<input type='hidden' type='text' name='url' value='";
  echo $xml->channels[0]->url;
  echo "'><br>";
  echo "<input type='submit' name='submit' value='PLAY CHANNEL'><br>";

  $xml = simplexml_load_file('channels.xml') or die('Failed to read data');
  echo $xml->channels[1]->name . "<br>";
  echo "<img class='responsive' src='";
  echo $xml->channels[1]->banner;
  echo "'><br>";
  echo "<form method='post' action='index.php'>";
  echo "<input type='hidden' type='text' name='url' value='";
  echo $xml->channels[1]->url;
  echo "'><br>";
  echo "<input type='submit' name='submit' value='PLAY CHANNEL'><br>";
  echo"</center>";

if(isset($_POST['url'])) {
    shell_exec("sudo killall player.bin");
    shell_exec("sudo player `youtube-dl -g ".($_POST['url'])." `>> /dev/null &");
}
?>
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XML

<?xml version="1.0" encoding="utf-8"?>
<data>
  <channels>
    <banner>https://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Sky-news-logo.svg/768px-Sky-news-logo.svg.png</banner>
    <url>https://www.youtube.com/channel/UCoMdktPbSTixAyNGwb-UYkQ/live</url>
  </channels>
  <channels>
    <banner>https://lh3.googleusercontent.com/proxy/DqTJr6u-LpXfWyrJscDsoa_XdZsXLTm1PXDLw_eJYRAlwx0RtNO4thah_YQhKk-vWmeSHkIfSGsClFIQmTWDS0iNGM3VeeEXrSzYSVPRFyEf5NQ9TVw0B9KYXg</banner>
    <url>https://www.youtube.com/channel/UCeY0bbntWzzVIaj2z3QigXg/live</url>
  </channels>
</data>
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