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                /** * 中文截取2,單字節截取模式 * @access public * @param string $str 需要截取的字符串 * @param int $slen 截取的長度 * @param int $startdd 開始標記處 * @return string */ function cn_substr($str, $slen, $startdd=0){ $cfg_soft_lang = PAGECHARSET; if($cfg_soft_lang=='utf-8') { return self::cn_substr_utf8($str, $slen, $startdd); } $restr = ''; $c = ''; $str_len = strlen($str); if($str_len < $startdd+1) { return ''; } if($str_len < $startdd + $slen || $slen==0) { $slen = $str_len - $startdd; } $enddd = $startdd + $slen - 1; for($i=0;$i<$str_len;$i++) { if($startdd==0) { $restr .= $c; } elseif($i > $startdd) { $restr .= $c; } if(ord($str[$i])>0x80) { if($str_len>$i+1) { $c = $str[$i].$str[$i+1]; } $i++; } else { $c = $str[$i]; } if($i >= $enddd) { if(strlen($restr)+strlen($c)>$slen) { break; } else { $restr .= $c; break; } } } return $restr; } /** * utf-8中文截取,單字節截取模式 * * @access public * @param string $str 需要截取的字符串 * @param int $slen 截取的長度 * @param int $startdd 開始標記處 * @return string */ function cn_substr_utf8($str, $length, $start=0) { if(strlen($str) < $start+1) { return ''; } preg_match_all("/./su", $str, $ar); $str = ''; $tstr = ''; //為了兼容mysql4.1以下版本,與數據庫varchar一致,這里使用按字節截取 for($i=0; isset($ar[0][$i]); $i++) { if(strlen($tstr) < $start) { $tstr .= $ar[0][$i]; } else { if(strlen($str) < $length + strlen($ar[0][$i]) ) { $str .= $ar[0][$i]; } else { break; } } } return $str; }
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