Description:
------------
When a bytea value is passed to pg_convert, it returns the output of pg_escape_bytea (bytea hex format in PostgreSQL 9+, see https://www.postgresql.org/docs/9.3/static/datatype-binary.html#AEN5385 ) enclosed in single quotes with the letter E prepended (an escape string constant). But it does not convert the backslash at the beginning to a double backslash. It should either convert \ to \\, or it should not prepend the E (normal string constant).

(Tested using PostgreSQL 9.3.14)

Test script:
---------------
$db = pg_connect('dbname=foo');
pg_query($db, 'create table image (data bytea)');
$vals = ['data' => file_get_contents('image.png')];
print_r(pg_convert($db, 'image', $vals));


Expected result:
----------------
Array
(
    ["data"] => E'\\x89504e47........


or:


Array
(
    ["data"] => '\x89504e47........

Actual result:
--------------
Array
(
    ["data"] => E'\x89504e47........