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
real
Tableau 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']);