Description:
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pg_fetch_result used in its short form: pg_fetch_result(resource $result, mixed $field). should fetch the next row each time it's called according to the documentation and the behavior of the other pg_fetch_* behavior.

in php-src, the pg_result->row internal counter is never incremented. This result in fetching the same row endlessly.

https://github.com/php/php-src/blob/php5_5_0/ext/pgsql/pgsql.c#L1182:L1188

Test script:
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<?php

$connection = pg_connect('...');

$result = pg_query($connection, 'SELECT v FROM (VALUES (1), (2), (3)) AS t(v)'):

// cause an infinite loop since the pg_fetch_result func fetch the first value endlessly.
while ($value = pg_fetch_result($result, 0)) {
  var_dump($value); // should be 1, 2 then 3.
}

Expected result:
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1, 2, 3

Actual result:
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1, 1, 1, 1, 1, ...