PHP XML Parser

php_xml_parser.php

<?php
 
function curl_get_html($options, $file) {
  $ch = curl_init();
  foreach ($options as $key => $value) {
    curl_setopt($ch, $key, $value);
  }
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $server_output = curl_exec($ch);
 
  curl_close($ch);
  @unlink($file);
  $fp = @fopen($file, 'w');
  fwrite($fp, $server_output);
  fclose($fp);
  return $file;
}
 
$url = array(
    "http://address1.com/sitemap.xml",
    "http://address2.com/site.xml",
    "http://address3.com/sitemap.xml"
);
 
$inputFile = 'input.html';
$outputFile = 'output.html';
 
if (!file_exists($inputFile)){
  $fp = fopen($inputFile, 'w');
  fclose($fp);
}else{
  unlink($inputFile);
  $fp = fopen($inputFile, 'w');
  fclose($fp);
}
 
if (!file_exists($outputFile)){
  $fp = fopen($outputFile, 'w');
  fclose($fp);
}else{
  unlink($outputFile);
  $fp = fopen($inputFile, 'w');
  fclose($fp);
}
  
foreach ($url as $page) {
  $options = array(CURLOPT_URL => $page,CURLOPT_POST => 0);
  
  if (!file_exists($inputFile)){
    $fp = fopen($inputFile, 'w');
    fclose($fp);
  }
  // CURL XML to local file
  $output = curl_get_html($options, $inputFile);
  
  // load & extract local file
  $xml = simplexml_load_file($output);
  $fp = @fopen($outputFile, 'a');
  
  foreach ($xml as $value) {
    //echo $value->loc . " \n";
    // extract node into text a line
    fwrite($fp, $value->loc . " \n");
  }
  fclose($fp);
}
 
?>