Description:
------------
Somehow pg_field_type() became very slow. Other functions that share the same code pg_field_name()/etc is not affected.



Test script:
---------------
<?php
$db = pg_connect('host=localhost') or die('Cannot connect db');
$res = pg_query('SELECT * FROM test');

$start = microtime(true);
for ($i = 0; $i < 10000; $i++) {
    pg_field_type($res, 1);
}
echo 'pg_field_type(): '.(microtime(true)-$start)."\n";


$start = microtime(true);
for ($i = 0; $i < 10000; $i++) {
    pg_field_name($res, 1);
}
echo 'pg_field_name(): '.(microtime(true)-$start)."\n";

$start = microtime(true);
for ($i = 0; $i < 10000; $i++) {
    pg_field_size($res, 1);
}
echo 'pg_field_type(): '.(microtime(true)-$start)."\n";






Expected result:
----------------
pg_filed_type() should be as fast as pg_filed_name()/etc

Actual result:
--------------
PHP 7 and master
[yohgaki@dev PHP-master]$ ./php-bin ../t.php
pg_field_type(): 3.1048510074615
pg_field_name(): 0.0023491382598877
pg_field_type(): 0.0014290809631348

PHP 5.6
[yohgaki@dev PHP-master]$ php ../t.php
pg_field_type(): 0.0019080638885498
pg_field_name(): 0.0013489723205566
pg_field_type(): 0.0010430812835693