php 截断字符串函数入门实例

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/**
 * php 截断字符串函数
 *
 * @param 
 * @arrange 五一二笔记网： 512pic.com
 **/
function htmlencode($string) {
 if(is_array($string)) {
  foreach($string as $key => $val) {
   $string[$key] = htmlencode($val);
  }
 } else {
  $string = preg_replace('/&amp;((#(\d{3,5}|x[a-fA-F0-9]{4})|[a-zA-Z][a-z0-9]{2,5});)/', '&\\1', str_replace(array('&', '"', '<', '>'), array('&amp;', '&quot;', '&lt;', '&gt;'), $string));
 }
 return $string;
}
function cutStr($string, $length = 0, $dot = '') {
 $string = strip_tags($string);
 $string = trim($string);
 $string = str_replace(array('&amp;', '&quot;', '&lt;', '&gt;'), array('&', '"', '<', '>'), $string);
 $strlen = strlen(phpcharset($string, 'GBK'));
 $charset = mb_detect_encoding($string, array('ASCII', 'UTF-8', 'GBK', 'GB2312', 'BIG5'));
 if($length && ($strlen > $length)) {
  $wordscut = '';
  if(strtolower($charset) == 'utf-8') {
   $n = 0;
   $tn = 0;
   $noc = 0;
   while($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;
   }
   $wordscut = substr($string, 0, $n);
  } else {
   for($i = 0; $i < $length - 1; $i++) {
	if(ord($string[$i]) > 127) {
	 $wordscut .= $string[$i].$string[$i + 1];
	 $i++;
	} else {
	 $wordscut .= $string[$i];
	}
   }
  }
  $wordscut .= $dot;
  $string = $wordscut;
 }
 return htmlencode($string);
}
/***   来自php教程（www.idcnote.com）   ***/

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