クラス yii\helpers\StringHelper

                public static function base64UrlDecode($input)
{
    return base64_decode(strtr($input, '-_', '+/'));
}

            

                public static function base64UrlEncode($input)
{
    return strtr(base64_encode($input), '+/', '-_');
}

            

                public static function basename($path, $suffix = '')
{
    $path = (string)$path;
    $len = mb_strlen($suffix);
    if ($len > 0 && mb_substr($path, -$len) === $suffix) {
        $path = mb_substr($path, 0, -$len);
    }
    $path = rtrim(str_replace('\\', '/', $path), '/');
    $pos = mb_strrpos($path, '/');
    if ($pos !== false) {
        return mb_substr($path, $pos + 1);
    }
    return $path;
}

            

                public static function byteLength($string)
{
    return mb_strlen((string)$string, '8bit');
}

            

                public static function byteSubstr($string, $start, $length = null)
{
    if ($length === null) {
        $length = static::byteLength($string);
    }
    return mb_substr((string)$string, $start, $length, '8bit');
}

            

                public static function countWords($string)
{
    return count(preg_split('/\s+/u', $string, 0, PREG_SPLIT_NO_EMPTY));
}

            

                public static function dirname($path)
{
    $normalizedPath = rtrim(
        str_replace('\\', '/', (string)$path),
        '/'
    );
    $separatorPosition = mb_strrpos($normalizedPath, '/');
    if ($separatorPosition !== false) {
        return mb_substr($path, 0, $separatorPosition);
    }
    return '';
}

            

                public static function endsWith($string, $with, $caseSensitive = true)
{
    $string = (string)$string;
    $with = (string)$with;
    if (!$bytes = static::byteLength($with)) {
        return true;
    }
    if ($caseSensitive) {
        // Warning check, see https://php.net/substr-compare#refsect1-function.substr-compare-returnvalues
        if (static::byteLength($string) < $bytes) {
            return false;
        }
        return substr_compare($string, $with, -$bytes, $bytes) === 0;
    }
    $encoding = Yii::$app ? Yii::$app->charset : 'UTF-8';
    $string = static::byteSubstr($string, -$bytes);
    return mb_strtolower($string, $encoding) === mb_strtolower($with, $encoding);
}

            

                public static function explode($string, $delimiter = ',', $trim = true, $skipEmpty = false)
{
    $result = explode($delimiter, $string);
    if ($trim !== false) {
        if ($trim === true) {
            $trim = 'trim';
        } elseif (!is_callable($trim)) {
            $trim = function ($v) use ($trim) {
                return trim($v, $trim);
            };
        }
        $result = array_map($trim, $result);
    }
    if ($skipEmpty) {
        // Wrapped with array_values to make array keys sequential after empty values removing
        $result = array_values(array_filter($result, function ($value) {
            return $value !== '';
        }));
    }
    return $result;
}

            

                public static function findBetween($string, $start, $end)
{
    $startPos = mb_strpos($string, $start);
    if ($startPos === false) {
        return null;
    }
    $startPos += mb_strlen($start);
    $endPos = mb_strrpos($string, $end, $startPos);
    if ($endPos === false) {
        return null;
    }
    return mb_substr($string, $startPos, $endPos - $startPos);
}

            

                public static function floatToString($number)
{
    // . and , are the only decimal separators known in ICU data,
    // so its safe to call str_replace here
    return str_replace(',', '.', (string) $number);
}

            

                public static function mask($string, $start, $length, $mask = '*')
{
    $strLength = mb_strlen($string, 'UTF-8');
    // Return original string if start position is out of bounds
    if ($start >= $strLength || $start < -$strLength) {
        return $string;
    }
    $masked = mb_substr($string, 0, $start, 'UTF-8');
    $masked .= str_repeat($mask, abs($length));
    $masked .= mb_substr($string, $start + abs($length), null, 'UTF-8');
    return $masked;
}

            

                public static function matchWildcard($pattern, $string, $options = [])
{
    if ($pattern === '*' && empty($options['filePath'])) {
        return true;
    }
    $replacements = [
        '\\\\\\\\' => '\\\\',
        '\\\\\\*' => '[*]',
        '\\\\\\?' => '[?]',
        '\*' => '.*',
        '\?' => '.',
        '\[\!' => '[^',
        '\[' => '[',
        '\]' => ']',
        '\-' => '-',
    ];
    if (isset($options['escape']) && !$options['escape']) {
        unset($replacements['\\\\\\\\']);
        unset($replacements['\\\\\\*']);
        unset($replacements['\\\\\\?']);
    }
    if (!empty($options['filePath'])) {
        $replacements['\*'] = '[^/\\\\]*';
        $replacements['\?'] = '[^/\\\\]';
    }
    $pattern = strtr(preg_quote($pattern, '#'), $replacements);
    $pattern = '#^' . $pattern . '$#us';
    if (isset($options['caseSensitive']) && !$options['caseSensitive']) {
        $pattern .= 'i';
    }
    return preg_match($pattern, (string)$string) === 1;
}

            

                public static function mb_ucfirst($string, $encoding = 'UTF-8')
{
    $firstChar = mb_substr((string)$string, 0, 1, $encoding);
    $rest = mb_substr((string)$string, 1, null, $encoding);
    return mb_strtoupper($firstChar, $encoding) . $rest;
}

            

                public static function mb_ucwords($string, $encoding = 'UTF-8')
{
    $string = (string) $string;
    if (empty($string)) {
        return $string;
    }
    $parts = preg_split('/(\s+\W+\s+|^\W+\s+|\s+)/u', $string, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
    $ucfirstEven = trim(mb_substr($parts[0], -1, 1, $encoding)) === '';
    foreach ($parts as $key => $value) {
        $isEven = (bool)($key % 2);
        if ($ucfirstEven === $isEven) {
            $parts[$key] = static::mb_ucfirst($value, $encoding);
        }
    }
    return implode('', $parts);
}

            

                public static function normalizeNumber($value)
{
    $value = (string) $value;
    $localeInfo = localeconv();
    $decimalSeparator = isset($localeInfo['decimal_point']) ? $localeInfo['decimal_point'] : null;
    if ($decimalSeparator !== null && $decimalSeparator !== '.') {
        $value = str_replace($decimalSeparator, '.', $value);
    }
    return $value;
}

            

                public static function startsWith($string, $with, $caseSensitive = true)
{
    $string = (string)$string;
    $with = (string)$with;
    if (!$bytes = static::byteLength($with)) {
        return true;
    }
    if ($caseSensitive) {
        return strncmp($string, $with, $bytes) === 0;
    }
    $encoding = Yii::$app ? Yii::$app->charset : 'UTF-8';
    $string = static::byteSubstr($string, 0, $bytes);
    return mb_strtolower($string, $encoding) === mb_strtolower($with, $encoding);
}

            

                public static function truncate($string, $length, $suffix = '...', $encoding = null, $asHtml = false)
{
    $string = (string)$string;
    if ($encoding === null) {
        $encoding = Yii::$app ? Yii::$app->charset : 'UTF-8';
    }
    if ($asHtml) {
        return static::truncateHtml($string, $length, $suffix, $encoding);
    }
    if (mb_strlen($string, $encoding) > $length) {
        return rtrim(mb_substr($string, 0, $length, $encoding)) . $suffix;
    }
    return $string;
}

            

                protected static function truncateHtml($string, $count, $suffix, $encoding = false)
{
    $config = \HTMLPurifier_Config::create(null);
    if (Yii::$app !== null) {
        $config->set('Cache.SerializerPath', Yii::$app->getRuntimePath());
    }
    $lexer = \HTMLPurifier_Lexer::create($config);
    $tokens = $lexer->tokenizeHTML($string, $config, new \HTMLPurifier_Context());
    $openTokens = [];
    $totalCount = 0;
    $depth = 0;
    $truncated = [];
    foreach ($tokens as $token) {
        if ($token instanceof \HTMLPurifier_Token_Start) { //Tag begins
            $openTokens[$depth] = $token->name;
            $truncated[] = $token;
            ++$depth;
        } elseif ($token instanceof \HTMLPurifier_Token_Text && $totalCount <= $count) { //Text
            if (false === $encoding) {
                preg_match('/^(\s*)/um', $token->data, $prefixSpace) ?: $prefixSpace = ['', ''];
                $token->data = $prefixSpace[1] . self::truncateWords(ltrim($token->data), $count - $totalCount, '');
                $currentCount = self::countWords($token->data);
            } else {
                $token->data = self::truncate($token->data, $count - $totalCount, '', $encoding);
                $currentCount = mb_strlen($token->data, $encoding);
            }
            $totalCount += $currentCount;
            $truncated[] = $token;
        } elseif ($token instanceof \HTMLPurifier_Token_End) { //Tag ends
            if ($token->name === $openTokens[$depth - 1]) {
                --$depth;
                unset($openTokens[$depth]);
                $truncated[] = $token;
            }
        } elseif ($token instanceof \HTMLPurifier_Token_Empty) { //Self contained tags, i.e. <img/> etc.
            $truncated[] = $token;
        }
        if ($totalCount >= $count) {
            if (0 < count($openTokens)) {
                krsort($openTokens);
                foreach ($openTokens as $name) {
                    $truncated[] = new \HTMLPurifier_Token_End($name);
                }
            }
            break;
        }
    }
    $context = new \HTMLPurifier_Context();
    $generator = new \HTMLPurifier_Generator($config, $context);
    return $generator->generateFromTokens($truncated) . ($totalCount >= $count ? $suffix : '');
}

            

                public static function truncateWords($string, $count, $suffix = '...', $asHtml = false)
{
    if ($asHtml) {
        return static::truncateHtml($string, $count, $suffix);
    }
    $words = preg_split('/(\s+)/u', trim($string), 0, PREG_SPLIT_DELIM_CAPTURE);
    if (count($words) / 2 > $count) {
        return implode('', array_slice($words, 0, ($count * 2) - 1)) . $suffix;
    }
    return $string;
}