Help needed with mb_convert_encoding()

[Alain Williams <addw@xxxxxxxxxxxx>]

I am trying to use this to validate input that is supposed to be UTF-8 and to
replace any bad characters with something - '?' would do.

I have the test program below. No matter what I try to give as an argument to
mb_substitute_character() it always removes the bad input sequence, I would like
to replace it.

Thanks in advance

    <?php
    mb_internal_encoding("UTF-8");

    // I have tried many lines like the 2 below
    // (comment out one or the other)
    mb_substitute_character((int)0x3013);
    mb_substitute_character((int)63); // '?' is ascii 63

    // \xC0\xBC is invalid UTF-8 - over long encoding, should be \x3C
    $input = "a bad angle bracket \xC0\xBC here";
    $valid = mb_convert_encoding($input, "UTF-8", "UTF-8");

    // I always find 2 spaces between 'bracket' and 'here'
    echo "valid='$valid'\n";


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Alain Williams
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