This is in the changelog for pecl trader extension version 0.4.1. Previous versions used 2 arguments, now only one (see https://pecl.php.net/package-changelog.php?package=trader&release=0.4.1)
(PECL trader >= 0.2.0)
trader_ht_sine — Transformation de Hilbert - Onde sinusoïdale
realTableau de valeurs réelles.
Retourne un tableau contenant les données calculées,
ou false si une erreur survient.
This is in the changelog for pecl trader extension version 0.4.1. Previous versions used 2 arguments, now only one (see https://pecl.php.net/package-changelog.php?package=trader&release=0.4.1)Documentation is missing a value
$hts = trader_ht_sine($a['open'],$a['close']);