PHP intercepts mixed Chinese and English strings_PHP tutorial-PHP Tutorial-php.cn

PHP intercepts mixed Chinese and English strings_PHP tutorial

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Release： 2016-07-13 10:33:49

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Today I encountered a problem of intercepting Chinese and English strings. In gbk, each Chinese character occupies two bytes. If they are all Chinese, you can use the substr() function to achieve it, but in Chinese Yingdu is in trouble. I found a good function in the previously collected code, which implements the interception function very well:

function get_word($string, $length, $dot = '..',$charset='gbk') {
    
    if(strlen($string) <= $length) {
        return $string;
    }
    $string = str_replace(array('　',' ', '&', '"', '<', '>'), array('','','&', '"', '<', '>'), $string);
    $strcut = '';
    if(strtolower($charset) == 'utf-8') {
        $n = $tn = $noc = 0;
        while($n < strlen($string)) {
            $t = ord($string[$n]);
            if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
                $tn = 1; $n++; $noc++;
            } elseif(194 <= $t && $t <= 223) {
                $tn = 2; $n += 2; $noc += 2;
            } elseif(224 <= $t && $t < 239) {
                $tn = 3; $n += 3; $noc += 2;
            } elseif(240 <= $t && $t <= 247) {
                $tn = 4; $n += 4; $noc += 2;
            } elseif(248 <= $t && $t <= 251) {
                $tn = 5; $n += 5; $noc += 2;
            } elseif($t == 252 || $t == 253) {
                $tn = 6; $n += 6; $noc += 2;
            } else {
                $n++;
            }
            if($noc >= $length) {
                break;
            }
        }
        if($noc > $length) {
            $n -= $tn;
        }
        $strcut = substr($string, 0, $n);
    } else {
        for($i = 0; $i < $length; $i++) {
            $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
        }
    }
    
    return $strcut.$dot;
}
$str = "欢迎 visit 简明 bkjia";
$str_result = get_word($str, 12);
echo $str_result;

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Test run results:

欢迎 visit..

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