php源码分析之DZX1.5字符串截断函数cutstr用法
这篇文章主要介绍了php源码分析之DZX1.5字符串截断函数cutstr用法,实例分析了DZX1.5中cutstr函数实现字符串截取的使用技巧,需要的朋友可以参考下。
本文实例讲述了php源码分析之DZX1.5字符串截断函数cutstr用法，分享给大家供大家参考，具体分析如下：
- <?php
- /**
- * 函数来源DZX1.5，文件所在 /source/function/function_core.php
- */
- define('CHARSET','UTF-8');
- function cutstr($string, $length, $dot="...") {
- if(strlen($string)<=$length) {
- return $string;
- }
- 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];
- }
- }
- $pos = strrpos($strcut, chr(1));
- if($pos !== false) {
- $strcut = substr($strcut,0,$pos);
- }
- return $strcut.$dot;
- }
- $string = '测试数据库ablci102020@(#)!)!测试劳动力ddk';
- echo cutstr($string,15);
- /*End of php*/
运行结果如下：
测试数据库ablci1020...