Warning: pg_query(): Query failed: ERROR:  SPI_execute_plan failed executing query "commit": SPI_ERROR_TRANSACTION
CONTEXT:  PL/pgSQL function "logreq" line  6  at SQL statement

CREATE OR REPLACE FUNCTION logreq(pstr varchar) RETURNS integer LANGUAGE plpgsql VOLATILE AS
$$
declare
  vret integer;
begin
  insert into logreq (str) values (pstr)
  returning id into vret;
  commit;
  return vret;
end;
$$

CREATE OR REPLACE FUNCTION test(preq varchar) RETURNS integer LANGUAGE plpgsql VOLATILE AS
$$
declare
  vret integer;
begin
  vret := logreq(preq);
  ..........
end;
$$

<?php
pg_query("select * from test('bla');");