Invalid byte sequence for encoding UTF-8

i am using php with postgresql. when i submit post query to the
server. i have the pg_exec error
<snip>
Warning: pg_query() [function.pg-query]: Query failed: ERROR: invalid
byte sequence for encoding "UTF8": 0x93 HINT: This error can also
happen if the byte sequence does not match the encoding expected by
the server, which is controlled by "client_encoding".
</snip>
is there any function to prevent this type of error. something i can
apply to any POST query
before i submit to pg_query() ?

thanks you.
.

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