Online PHP editor | rfc for NIB11

<?php /** * ord() alternative that works with UTF8 characters * @param string $c * * @return int UTF-8 character code value */ function getUTF8CharCode($c) { $h = ord($c{0}); if ($h <= 0x7F) { return $h; } else if ($h < 0xC2) { return false; } else if ($h <= 0xDF) { return ($h & 0x1F) << 6 | (ord($c{1}) & 0x3F); } else if ($h <= 0xEF) { return ($h & 0x0F) << 12 | (ord($c{1}) & 0x3F) << 6 | (ord($c{2}) & 0x3F); } else if ($h <= 0xF4) { return ($h & 0x0F) << 18 | (ord($c{1}) & 0x3F) << 12 | (ord($c{2}) & 0x3F) << 6 | (ord($c{3}) & 0x3F); } else { return -1; } } /** * Escape a single character for CSS context. * @param $c * @return string */ function escapeCSSCharacter($c) { return "\\" . base_convert(getUTF8CharCode($c), 10, 16) . " "; } /** * Escape CSS rule * * @param string $data The CSS rule * @param array $immuneChars Array of immune character. These characters will not be escaped. * * @return string Escaped string */ function escapeCSSValue($data, array $immuneChars = array()) { $result = ""; for ($i = 0; $i < mb_strlen($data); $i++) { $currChar = mb_substr($data, $i, 1); if (getUTF8CharCode($currChar) < 256 && //Character value is less than 256 !preg_match("/^\w$/", $currChar) && //Character is not alphanumeric (underscore is considered safe too) !in_array($currChar, $immuneChars) //Character is not immune ) { $result .= escapeCSSCharacter($currChar); } else { $result .= $currChar; } } return $result; } $colorRule = "color: " . escapeCSSValue("#BADA55;}*{display:none;}", array("#")) . ";"; //Will be obviously broken, but will not break the rest of the document. echo $colorRule;

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