In most databases an queries , there is  primary key/unique constraint so i suggest to 
 enhnace  function  pg_fetch_all ( resource result)

to 

pg_fetch_all ( resource result,[string key_column_name]) bz adding a second optional 
parameter,  so anybody can access all  returned data like this:

$data= pg_fetch_all ($resource,$key_column_name]);
$column=$data['value of the key, specified in 2nd argument to pg_fetch_all' ]['name of 
the column'];

ie all tuples/lines  from result can be accessed via associative array, with key is 
the value of specified column.

Yes, I think it can be done by wery simle code too, but....

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