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Filename : str_pad.php
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<?php
/**
* @package utf8
*/

//---------------------------------------------------------------
/**
* Replacement for str_pad. $padStr may contain multi-byte characters.
*
* @author Oliver Saunders <oliver (a) osinternetservices.com>
* @param string $input
* @param int $length
* @param string $padStr
* @param int $type ( same constants as str_pad )
* @return string
* @see http://www.php.net/str_pad
* @see utf8_substr
* @package utf8
*/
function utf8_str_pad($input, $length, $padStr = ' ', $type = STR_PAD_RIGHT) {

    $inputLen = utf8_strlen($input);
    if ($length <= $inputLen) {
        return $input;
    }

    $padStrLen = utf8_strlen($padStr);
    $padLen = $length - $inputLen;

    if ($type == STR_PAD_RIGHT) {
        $repeatTimes = ceil($padLen / $padStrLen);
        return utf8_substr($input . str_repeat($padStr, $repeatTimes), 0, $length);
    }

    if ($type == STR_PAD_LEFT) {
        $repeatTimes = ceil($padLen / $padStrLen);
        return utf8_substr(str_repeat($padStr, $repeatTimes), 0, floor($padLen)) . $input;
    }

    if ($type == STR_PAD_BOTH) {

        $padLen/= 2;
        $padAmountLeft = floor($padLen);
        $padAmountRight = ceil($padLen);
        $repeatTimesLeft = ceil($padAmountLeft / $padStrLen);
        $repeatTimesRight = ceil($padAmountRight / $padStrLen);

        $paddingLeft = utf8_substr(str_repeat($padStr, $repeatTimesLeft), 0, $padAmountLeft);
        $paddingRight = utf8_substr(str_repeat($padStr, $repeatTimesRight), 0, $padAmountLeft);
        return $paddingLeft . $input . $paddingRight;
    }

    trigger_error('utf8_str_pad: Unknown padding type (' . $type . ')',E_USER_ERROR);
}