define(CHARSET, 'UTF-8'); // 系統默認編碼 /** * 根據中文裁減字符串 * @param $string - 字符串 * @param $length - 長度 * @param $doc - 縮略後綴 * @return 返回帶省略號被裁減好的字符串 */ 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; }
