What does the following line in DB/common.php do ?

(line 182:) $stmt = (int)$this->prepare_maxstmt++;

I have to outcomment the line when I recall execute() on the same prepared query! 

In the original code $realquery, in execute(), is set to the following string when calling it again with the same prepared query...

[db_error: message="DB Error: invalid" code=-8 mode=return level=notice prefix="" prepend="" append=""]



--------------------------------
example:


<?php

include("/usr/lib/php4/DB/pgsql.php");

$dsn = 'pgsql://127.0.0.1/web';

$db = new DB_pgsql();
$db->connect($dsn);

$stm = $db->prepare('SELECT * FROM pg_type WHERE typname = ? ORDER BY typname;');

$r1 = $db->execute($stm, array('_point'));
$r2 = $db->execute($stm, array('_bit'));

while($b = $db->fetchrow($r1)) {
    echo $b[0].' - '.$b[1].'<br>';
}

while($b = $db->fetchrow($r2)) {
    echo $b[0].' - '.$b[1].'<br>';
}

?>