valid_url
function valid_url
valid_url($url, $absolute = FALSE)
Verifies the syntax of the given URL.
This function should only be used on actual URLs. It should not be used for Drupal menu paths, which can contain arbitrary characters. Valid values per RFC 3986.
Parameters
$url: The URL to verify.
$absolute: Whether the URL is absolute (beginning with a scheme such as "http:").
Return value
TRUE if the URL is in a valid format.
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