CHECK REMOTE FILE EXISTS

gistfile1.php

<?php
// CHECK REMOTE FILE EXISTS
function remote_file_exists( $url_file ) {
  $url_file = trim( $url_file );
  if ( empty( $url_file ) )
    return FALSE;

  $url_arr = parse_url( $url_file );
  if ( !is_array( $url_arr ) || empty( $url_arr ) )
    return FALSE;

  $host = $url_arr['host'];
  $path = $url_arr['path'] . "?" . $url_arr['query'];
  $port = isset( $url_arr['port'] ) ? $url_arr['port'] : "80";
  $fp = fsockopen( $host, $port, $err_no, $err_str, 30 );
  if ( !$fp )
    return FALSE;

  $request_str = "GET " . $path . " HTTP/1.1\r\n";
  $request_str .= "Host:" . $host . "\r\n";
  $request_str .= "Connection:Close\r\n\r\n";
  fwrite( $fp, $request_str );
  //fread replace fgets
  $first_header = fread( $fp, 128 );
  fclose( $fp );
  if ( trim( $first_header ) == "" )
    return FALSE;

  //check $url_file "Content-Location"
  if ( !preg_match( "/200/", $first_header ) || preg_match( "/Location:/", $first_header ) )
    return FALSE;

  return TRUE;
}
?>