[GENERAL] how to ignore invalid byte sequence for encoding without using sql_ascii?

I am now importing the dump file of wikipedia into my postgresql using maintains/importDump.php. It fails on 'ERROR: invalid byte sequence for encoding UTF-8'. Is there any way to let pgsql just ignore the invalid characters ( i mean that drop the invalid ones ), that the script will keep going without die on this error.

I know that i can using sql_ascii or even modify the importDump.php, but those are not so easy to do as i thought.

thanks for help

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