/**
* Cast a value to string.
*
* @static
*
* @param mixed $value Value to cast.
* @param bool $array2null (Optional) Whether to return null for an array or to cast the
* individual values within the array to the chosen type.
* @param bool $allow_empty (Optional) Whether to allow empty strings/arrays/objects.
*
* @return string|array|null
*/
function _string($value, $array2null = true, $allow_empty = true)
{
if (is_string($value) && ($value !== '' || $allow_empty === true)) {
return $value;
} else {
if (is_int($value) || is_float($value)) {
return strval($value);
} else {
if ($array2null === false && is_array($value)) {
return CastToType::recurse($value, '_string', $allow_empty);
} else {
if (is_object($value) && get_parent_class($value) === 'SplType') {
if ((string) $value == $value) {
return (string) $value;
} else {
return null;
}
} else {
if (is_object($value) && method_exists($value, '__toString')) {
return (string) $value;
}
}
}
}
}
return null;
}
