本文实例讲述了PHP针对中英文混合字符串长度判断及截取方法。分享给大家供大家参考，具体如下：
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/** * * 中英混合字符串长度判断 * @param unknown_type $str * @param unknown_type $charset */function strLength($str, $charset = 'utf-8') { if ($charset == 'utf-8') $str = iconv ( 'utf-8', 'gb2312', $str ); $num = strlen ( $str ); $cnNum = 0; for($i = 0; $i < $num; $i ++) { if (ord ( substr ( $str, $i + 1, 1 ) ) > 127) { $cnNum ++; $i ++; } } $enNum = $num - ($cnNum * 2); $number = ($enNum / 2) + $cnNum; return ceil ( $number );} |
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/** * * 中英混合的字符串截取 * @param unknown_type $sourcestr * @param unknown_type $cutlength */function cut_str($sourcestr, $cutlength) { $returnstr = ''; $i = 0; $n = 0; $str_length = strlen ( $sourcestr ); //字符串的字节数 while ( ($n < $cutlength) and ($i <= $str_length) ) { $temp_str = substr ( $sourcestr, $i, 1 ); $ascnum = Ord ( $temp_str ); //得到字符串中第$i位字符的ascii码 if ($ascnum >= 224) //如果ASCII位高与224， { $returnstr = $returnstr . substr ( $sourcestr, $i, 3 ); //根据UTF-8编码规范，将3个连续的字符计为单个字符 $i = $i + 3; //实际Byte计为3 $n ++; //字串长度计1 } elseif ($ascnum >= 192) //如果ASCII位高与192， { $returnstr = $returnstr . substr ( $sourcestr, $i, 2 ); //根据UTF-8编码规范，将2个连续的字符计为单个字符 $i = $i + 2; //实际Byte计为2 $n ++; //字串长度计1 } elseif ($ascnum >= 65 && $ascnum <= 90) //如果是大写字母， { $returnstr = $returnstr . substr ( $sourcestr, $i, 1 ); $i = $i + 1; //实际的Byte数仍计1个 $n ++; //但考虑整体美观，大写字母计成一个高位字符 } else //其他情况下，包括小写字母和半角标点符号， { $returnstr = $returnstr . substr ( $sourcestr, $i, 1 ); $i = $i + 1; //实际的Byte数计1个 $n = $n + 0.5; //小写字母和半角标点等与半个高位字符宽... } } if ($str_length > $cutlength) { $returnstr = $returnstr . "..."; //超过长度时在尾处加上省略号 } return $returnstr;} |
希望本文所述对大家PHP程序设计有所帮助。
