字符串截取，支持中文

getStrTruncate.php

<?php
function getStrTruncate($string, $length = 80, $etc = ''){  
    if ($length == 0) return '';  
    mb_internal_encoding("UTF-8");  
  
    $string = str_replace("\n","",$string);  
    $strlen = mb_strwidth($string);  
    if ($strlen > $length) {  
        $etclen = mb_strwidth($etc);  
        $length = $length - $etclen;  
        $str=''; $n = 0;  
        for($i=0; $i<$length; $i++) {  
            $c = mb_substr($string, $i, 1);  
            $n += mb_strwidth($c);  
            if ($n>$length) { break; }  
            $str .= $c;  
        }  
        return $str.$etc;  
    } else {  
        return $string;  
    }  
}  
  
echo getStrTruncate("海底苍鹰博客",7);  //结果是海底苍，utf8一个汉字对应二个字符