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Remove invisible Unicode characters that can cause #7176

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Remove invisible Unicode characters that can cause #7176

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12 changes: 11 additions & 1 deletion main/exercise/fill_blanks.class.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1449,7 +1449,17 @@ public static function clearStudentAnswer($answer): string
private static function trimOption($text)
{
$text = trim($text);


// Remove invisible Unicode characters that can cause comparison issues
// U+200B = ZERO WIDTH SPACE
// U+200C = ZERO WIDTH NON-JOINER
// U+200D = ZERO WIDTH JOINER
// U+FEFF = ZERO WIDTH NO-BREAK SPACE (BOM)
$text = str_replace("\u{200B}", '', $text);
$text = str_replace("\u{200C}", '', $text);
$text = str_replace("\u{200D}", '', $text);
$text = str_replace("\u{FEFF}", '', $text);

return preg_replace("/\s+/", ' ', $text);
}
}
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