php: Cut string function method according to Chinese_PHP tutorial

WBOY
Release: 2016-07-13 17:19:16
Original
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define(CHARSET, 'UTF-8'); // 系统默认编码  

  
/**
* Cut the string according to Chinese
* @param $string - string
* @param $length - length
* @param $doc - abbreviated suffix
* @return returns the truncated string with ellipses
*/  
function cutstr( $string, $length, $dot = '...' ) {  
    if ( strlen( $string ) <= $length ) {  
        return $string;  
    }  
    $pre = chr( 1 );  
    $end = chr( 1 );  
    $string = str_replace( array( '&', '"', '<', '>' ), array( $pre . '&' . $end, $pre . '"' . $end, $pre . '<' . $end, $pre . '>' . $end ), $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];  
        }  
    }  
$strcut = str_replace( array( $pre . '&' . $end, $pre . '"' . $end, $pre . '<' . $end, $pre . '>' . $ end ), array( '&', '"', '<', '>' ), $strcut );
$pos = strrpos( $strcut, chr( 1 ) );
if ( $pos !== false ) {
$strcut = substr( $strcut, 0, $pos );
}
return $strcut . $dot;
}

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/532686.htmlTechArticledefine(CHARSET, UTF-8); // System default encoding/** * Cut the string according to Chinese* @param $string - string* @param $length - length* @param $doc - abbreviation suffix* @return returns with...
source:php.cn
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