function _api_convert_encoding_supports($encoding)
{
static $supports = array();
if (!isset($supports[$encoding])) {
$supports[$encoding] = _api_get_character_map_name(api_refine_encoding_id($encoding)) != '';
}
return $supports[$encoding];
}
/**
* This function checks whether two $encoding are equal (same, equvalent).
* @param string/array $encoding1 The first encoding
* @param string/array $encoding2 The second encoding
* @param bool $strict When this parameter is TRUE the comparison ignores aliases of encodings. When the parameter is FALSE, aliases are taken into account.
* @return bool Returns TRUE if the encodings are equal, FALSE otherwise.
*/
function api_equal_encodings($encoding1, $encoding2, $strict = false)
{
static $equal_encodings = array();
if (is_array($encoding1)) {
foreach ($encoding1 as $encoding) {
if (api_equal_encodings($encoding, $encoding2, $strict)) {
return true;
}
}
return false;
} elseif (is_array($encoding2)) {
foreach ($encoding2 as $encoding) {
if (api_equal_encodings($encoding1, $encoding, $strict)) {
return true;
}
}
return false;
}
if (!isset($equal_encodings[$encoding1][$encoding2][$strict])) {
$encoding_1 = api_refine_encoding_id($encoding1);
$encoding_2 = api_refine_encoding_id($encoding2);
if ($encoding_1 == $encoding_2) {
$result = true;
} else {
if ($strict) {
$result = false;
} else {
$alias1 = _api_get_character_map_name($encoding_1);
$alias2 = _api_get_character_map_name($encoding_2);
$result = !empty($alias1) && !empty($alias2) && $alias1 == $alias2;
}
}
$equal_encodings[$encoding1][$encoding2][$strict] = $result;
}
return $equal_encodings[$encoding1][$encoding2][$strict];
}
