trader_ht_phasor is documented to take only one value
it requires exactly 2 parameters to operate properly 
example is 
$htpa = trader_ht_phasor($a['open'],$a['close']);(PECL trader >= 0.2.0)
trader_ht_phasor — Transformation de Hilbert - Composants de la phase
realTableau de valeurs réelles.
   Retourne un tableau contenant les données calculées,
   ou false si une erreur survient.
  
trader_ht_phasor is documented to take only one value
it requires exactly 2 parameters to operate properly 
example is 
$htpa = trader_ht_phasor($a['open'],$a['close']);