Reading boolean correctly from Postgres by PHP

Question

The main problem of this thread is moved to here about boolean datatype in PHP / Postgres.

The problem is the conversion of t and f to

Answer 1

Select boolean field from postgre as ::int and in php cast to bool.

 "SELECT a_moderator::int 
        FROM users
        WHERE email = $1;"

$isModerator = (bool)$row['a_moderator'];

Answer 2

Try:

if ( $_SESSION['login']['a_moderator'] ) {
  // do this
}

It is a boolean, not a string.

Answer 3

This isn't a direct answer to the question, but here's an example demonstrating that pg_*() functions do in fact return the postgres boolean true value as the PHP string 't':

[example]$ cat scratch.php 
<?php
//connect to the database...
require_once 'db_connect.php';

//query
$rows = pg_fetch_all(pg_query('SELECT TRUE::bool AS true'));
//dump returned array, and test with type-safe identity comparator
var_dump($rows, $rows[0]['true'] === 't');

[example]$ php scratch.php 
array(1) {
  [0]=>
  array(1) {
    ["true"]=>
    string(1) "t"
  }
}
bool(true)
[example]$

Answer 4

I wrote a function in postgres to export boolean to PHP readable boolean:

You just use it this way:

SELECT php_bool(columna) from
table

Here is the function:

CREATE OR REPLACE FUNCTION php_bool(boolean)
RETURNS numeric LANGUAGE plpgsql

AS
$BODY$

BEGIN

  IF $1 = true THEN
    RETURN 1;
  ELSE
    RETURN 0;
  END IF;
END
$BODY$