drupal_valid_http_host

• Drupal 5
• Drupal 6
• Drupal 7

Versions

5 – 7

drupal_valid_http_host($host)

Validate that a hostname (for example $_SERVER['HTTP_HOST']) is safe.

As $_SERVER['HTTP_HOST'] is user input, ensure it only contains characters allowed in hostnames. See RFC 952 (and RFC 2181). $_SERVER['HTTP_HOST'] is lowercased.

Return value

TRUE if only containing valid characters, or FALSE otherwise.

Code

includes/bootstrap.inc, line 241

<?php
function drupal_valid_http_host($host) {
  return preg_match('/^\[?(?:[a-z0-9-:\]_]+\.?)+$/', $host);
}
?>

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