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When selecting data from a PostgreSQL database using quoted aliases for column names (to preserve case, for example), pg_field_num() seems to expect its input to also contain double quotes. However, returned values from functions like pg_field_name() and pg_fetch_assoc() do not contain double quotes. PostgreSQL's own client also does not include double quotes in the resulting column names. Even if the behavior of pg_field_num is intentional, there does not seem to be a way to determine if field aliases have been quoted using the result resource only.
I suggest fixing pg_field_num() so that it is consistent with the other PostgreSQL functions. I would expect the function to accept the actual field name, not encapsulated in double quotes.
$result = pg_query('SELECT \'test\' AS "TeSt"');
var_dump(pg_field_name($result, 0)); // returns TeSt
var_dump(pg_field_num($result, 'TeSt')); // returns -1 (error)
var_dump(pg_field_num($result, '"TeSt"')); // returns 0 (first column)
I expect pg_field_num($result, 'TeSt') to return 0 instead of an error.
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