<?php
function seems_utf8($Str) {
for ($i=0; $i<strlen($Str); $i++) {
if (ord($Str[$i]) < 0x80) $n=0; # 0bbbbbbb
elseif ((ord($Str[$i]) & 0xE0) == 0xC0) $n=1; # 110bbbbb
elseif ((ord($Str[$i]) & 0xF0) == 0xE0) $n=2; # 1110bbbb
elseif ((ord($Str[$i]) & 0xF0) == 0xF0) $n=3; # 1111bbbb
else return false; # Does not match any model
for ($j=0; $j<$n; $j++) { # n octets that match 10bbbbbb follow ?
if ((++$i == strlen($Str)) || ((ord($Str[$i]) & 0xC0) != 0x80)) return false;
}
}
return true;
}
?>
ou
<?php
if (iconv('UTF-8', 'UTF-8', $input) != $input) {
/* It's not UTF-8--for me, it's probably CP1252, the Windows version of Latin 1, with directed quotation marks and the Euro sign. */
}
?>
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: 
PHP: 471
Code:
