Description:
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It is not possible to include the schema when passing a table name to pg_copy_from, e.g. pg_copy_from($conn, "schema.tablename", $rows).

r291312 addressed this issue for pg_copy_to, though the attached patch seems simpler.

Test script:
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// setup
pg_query($db, 'CREATE SCHEMA temp_test_schema');
pg_query($db, 'CREATE TABLE temp_test_schema.temp_test_table (a INT)');

// test
pg_copy_from($db, 'temp_test_schema.temp_test_table', array('1'));

// cleanup
pg_query($db, 'DROP SCHEMA temp_test_schema CASCADE');

Expected result:
----------------
The row is copied without error

Actual result:
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pg_copy_from() : Copy command failed: ERROR: relation "temp_test_schema.temp_test_table" does not exist