PHP统计包含汉字的字符长度 ( 改善Smarty modifier.truncate.php 中文支持)

   在网上看到关于汉字的个数统计,弄得很复杂,其实很简单,只要正则表达式写得得当,两三行代码就能统计出来。

  <?php
          $a ="我爱编程,我爱PHP" ;
          $b = preg_replace("/[/x{4e00}-/x{9fa5}]{1}/u","*", $a);
          echo "字符个数为:".  strlen($b);

 ?>

 是不是很简单啊,

 以这个例子,修改了smarty中的 插件 :

/** * Smarty truncate modifier plugin (support chinese characters ) * * Type: modifier<br> * Name: truncate<br> * Purpose: Truncate a string to a certain length if necessary, * optionally splitting in the middle of a word, and * appending the $etc string or inserting $etc into the middle. * @link http://smarty.php.net/manual/en/language.modifier.truncate.php * truncate (Smarty online manual) * @author Monte Ohrt <monte at ohrt dot com> * @modify by Chelin Tsien * @param string * @param integer * @param string * @param boolean * @param boolean * @return string */ function smarty_modifier_truncate($string, $length = 80, $etc = "...", $break_words = false, $middle = false) { if ($length == 0) return ""; if (_strlen($string) > $length) { $length -= min($length, strlen($etc)); if (!$break_words && !$middle) { $string = preg_replace("//s+?(/S+)?$/", "", _substr($string, 0, $length+1)); } if(!$middle) { $temp_str = _substr($string, 0, $length); return $temp_str . $etc; } else { return _substr($string, 0, $length/2) . $etc . _substr($string, -$length/2); } } else { return $string; } } /* * Returns the portion of string specified by the start and length parameters (support chinese characters ) * @author Chelin Tsien * @param string * @param integer * @param integer * @return string */ function _substr($string, $start, $length = false) { $flag = preg_match_all("/[/x{0800}-/x{ffff}/w !/"#$%&"()*+,-.//:;<=>?@[//]^_`{|}~/s]{1}/u", $string, $match); if($flag) { $input = $match[0]; $str_arr = array_slice($input,$start, $length); $str = implode("", $str_arr); return $str; } } /* * Return the length of the given string (support chinese characters ) * @author Chelin Tsien * @param string * @param integer * @param integer * @return string */ function _strlen($string) { $tmp_string = preg_replace("/[/x{0800}-/x{ffff}/w !/"#$%&"()*+,-.//:;<=>?@[//]^_`{|}~/s]{1}/u", "*", $string); $tmp_length = strlen($tmp_string); return (int)$tmp_length; } function csubstr($string, $start=0, $sublen,$append=1, $code="UTF-8") { if($code=="UTF-8") { $pa="/[/x01-/x7f]|[/xc2-/xdf][/x80-/xbf]|/xe0[/xa0-/xbf][/x80-/xbf]|[/xe1-/xef][/x80-/xbf][/x80-/xbf]|/xf0[/x90-/xbf][/x80-/xbf][/x80-/xbf]|[/xf1-/xf7][/x80-/xbf][/x80-/xbf][/x80-/xbf]/"; preg_match_all($pa,$string,$t_string); if(count($t_string[0])-$start>$sublen && $append) { return join("",array_slice($t_string[0],$start,$sublen))."..."; } return join("",array_slice($t_string[0],$start,$sublen)); } else { //$start=$start*2; //$sublen=$sublen*2; $strlen=strlen($string); $tmpstr=""; for($i=0;$i<$strlen;$i++) { if($i>=$start&&$i<($start+$sublen)) { if(ord(substr($string,$i,1))>129) { $tmpstr.=substr($string,$i,2); } else { $tmpstr.=substr($string,$i,1); } } if(ord(substr($string,$i,1))>129)$i++; } if( strlen($tmpstr)<$strlen && $append) { $tmpstr.="..."; } return $tmpstr; } }