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Homephp教程php手册中文字符串长度php代码

下面代码可以判断混合体的字符串中中文字符串的长度的一个函数,因为php不支持中文计算所以我们专业自定义了一个函数。

下面代码可以判断混合体的字符串中中文字符串的长度的一个函数,因为php教程不支持中文计算所以我们专业自定义了一个函数。

header('Content-type:text/html;charset=utf-8'); 
/** 
* 可以统计中文字符串长度的函数 
* @param $str 要计算长度的字符串 
* @param $type 计算长度类型,0(默认)表示一个中文算一个字符,1表示一个中文算两个字符 
* 
*/ 
function abslength($str) 
{ 
if(empty($str)){ 
return 0; 
} 
if(function_exists('mb_strlen')){ 
return mb_strlen($str,'utf-8'); 
} 
else { 
preg_match_all("/./u", $str, $ar); 
return count($ar[0]); 
} 
} 
$str = '我们都是中国人啊,ye!'; 
$len = abslength($str); 
var_dump($len); //return 12 
$len = abslength($str,'1'); 
echo '<br>'.$len; //return 22 
/* 
utf-8编码下截取中文字符串,参数可以参照substr函数 
@param $str 要进行截取的字符串 
@param $start 要进行截取的开始位置,负数为反向截取 
@param $end 要进行截取的长度 
*/ 
function utf8_substr($str,$start=0) { 
if(empty($str)){ 
return false; 
} 
if (function_exists('mb_substr')){ 
if(func_num_args() >= 3) { 
$end = func_get_arg(2); 
return mb_substr($str,$start,$end,'utf-8'); 
} 
else { 
mb_internal_encoding("UTF-8"); 
return mb_substr($str,$start); 
} 
} 
else { 
$null = ""; 
preg_match_all("/./u", $str, $ar); 
if(func_num_args() >= 3) { 
$end = func_get_arg(2); 
return join($null, array_slice($ar[0],$start,$end)); 
} 
else { 
return join($null, array_slice($ar[0],$start)); 
} 
} 
} 
$str2 = 'wo要截取zhongwen'; 
echo '<br>'; 
echo utf8_substr($str2,0,-4); //return wo要截取zhon
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