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Added some documentation

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This commit is contained in:
Michael Vogel 2016-02-03 05:00:26 +01:00
parent f604f13d7d
commit 47d2e3b142
1 changed files with 12 additions and 0 deletions
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12
include/items.php
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@ -773,13 +773,25 @@ function item_add_language_opt(&$arr) {
}
}
/**
* @brief Creates an unique guid out of a given uri
*
* @param string $uri uri of an item entry
* @return string unique guid
*/
function uri_to_guid($uri) {
// Our regular guid routine is using this kind of prefix as well
// We have to avoid that different routines could accidentally create the same value
$parsed = parse_url($uri);
$guid_prefix = hash("crc32", $parsed["host"]);
// Remove the scheme to make sure that "https" and "http" doesn't make a difference
unset($parsed["scheme"]);
$host_id = implode("/", $parsed);
// We could use any hash algorithm since it isn't a security issue
$host_hash = hash("ripemd128", $host_id);
return $guid_prefix.$host_hash;