php源码分析之DZX1.5字符串截断函数cutstr用法

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

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...

希望本文所述对大家的php程序设计有所帮助。