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 — Transformada de Hilbert - Onda Senoidal
realArray de valores reais.
Retorna um array com os dados calculados ou false em caso de falha.
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']);