中文字符串长度php代码
preg_match
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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