AWS Cloudfront Header Checker For PHP

amazonCloudfrontHeaders.function.php

<?php

function getHeaders( $header_name = null ) {
  $headervals = "";
  $keys = array_keys( $_SERVER );
  if ( is_null( $header_name ) ) {
    $headers = preg_grep( "/^HTTP_(.*)/si", $keys );
  } else {
    $header_name_safe = str_replace( "-", "_", strtoupper( preg_quote( $header_name ) ) );
    $headers = preg_grep( "/^HTTP_${header_name_safe}$/si", $keys );
  }
  foreach ( $headers as $header ) {
    if ( is_null( $header_name ) ) {
      $headervals[ substr( $header, 5 ) ] = $_SERVER[ $header ];
    } else {
      return $_SERVER[ $header ];
    }
  }
  return $headervals;
}

$currenthost = $_SERVER[ 'HTTP_HOST' ];
$CloudFront_Viewer_Country = getHeaders( "CloudFront-Viewer-Country" );
$X_Forwarded_For_Cloudfront = getHeaders( "X-Forwarded-For" );
$CloudFront_Viewer_RemoteA = $_SERVER[ 'REMOTE_ADDR' ];
$X_USER_REAL_IP = explode( ",", $X_Forwarded_For_Cloudfront );
$getLanguage = getHeaders( "Accept-Language" );
$explode = explode( ";", $getLanguage );
$GetRealLanguage = explode( ",", $explode[ 0 ] );
$CloudFront_Accept_Language = $GetRealLanguage[ 0 ];