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 — Hilbert Transform - SineWave
$real
) : array
real
Un tablou cu valori reale.
Returns an array with calculated data or false on failure.
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']);