Update StringUtils.php
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@ -45,8 +45,8 @@ class StringUtils
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return hash_equals($knownString, $userInput);
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}
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$knownLen = strlen($knownString);
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$userLen = strlen($userInput);
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$knownLen = self::safeStrlen($knownString);
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$userLen = self::safeStrlen($userInput);
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// Extend the known string to avoid uninitialized string offsets
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$knownString .= $userInput;
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@ -63,4 +63,18 @@ class StringUtils
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// They are only identical strings if $result is exactly 0...
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return 0 === $result;
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}
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/**
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* Return the number of bytes in a string
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*
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* @param string $string The string whose length we wish to obtain
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* @return int
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*/
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public static function safeStrlen($string)
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{
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if (function_exists('mb_strlen')) {
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return mb_strlen($string, '8bit');
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}
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return strlen($string);
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}
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}
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