$p1 = ':p1'; $p2 = ':p2';
$v1 = 'deny_self_tariff_change'; $v2 = 296090391;
$args = [ [$p1, $v1],  [$p2, $v2] ];

$sth = oci_parse($dbh->conn, "select SI_SUBJECTS_PKG_S.GET_SUBJ_VALUE_TYPE_ID( :p1, SI_SUBJECTS_PKG_S.GET_SUBJ_TYPE_ID(:p2) ) from dual");
foreach( $args as $a ) {
    oci_bind_by_name($sth, $a[0], $a[1], -1);
}
oci_execute( $sth );
print_r( oci_fetch_array($sth) );




===================

result:

===================

 # /usr/lib64/php7.0/bin/php test.php
Array
(
    [0] =>
    [SI_SUBJECTS_PKG_S.GET_SUBJ_VALUE_TYPE_ID(:P1,SI_SUBJECTS_PKG_S.GET_SUBJ_TYPE_ID(:P2))] =>
)