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Homephp教程php手册php中ord实现中文字符串截取并解决乱码问题

php中ord实现中文字符串截取并解决乱码问题

Jun 13, 2016 am 09:55 AM
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下面我们举了二个例子都是利用ord来实例字符ascii判断以勉出现中文乱码的问题,这个函数的功能我们可以参考http://www.bKjia.c0m/phper/php/41030.htm 文章,它很好了介绍了此函数的用法。

 

 代码如下 复制代码

//a字符
$str=(pack("a*", "中国"));
echo $str,"=",strlen($str),"字节n";
getascill($str);
//h字符
$str=(pack("h*", "fffe"));
echo $str,"=",strlen($str),"字节n";
getascill($str);
//c字符
$str=(pack("c*", "55","56","57"));
echo $str,"=",strlen($str),"字节n";
getascill($str);

//i字符 短整形 32位 4个字节 64位8个字节
$str=(pack("i", "100"));
echo $str,"=",strlen($str),"字节n";
getascill($str);

//s字符 短整形 2个字节
$str=(pack("s", "100"));
echo $str,"=",strlen($str),"字节n";
getascill($str);

//l字符 长整形 4个字节
$str=(pack("l", "100"));
echo $str,"=",strlen($str),"字节n";
getascill($str);

//f字符 单精度浮点 4个字节
$str=(pack("f", "100"));
echo $str,"=",strlen($str),"字节n";
getascill($str);

//d字符 双精度浮点 8个字节
$str=(pack("d", "100"));
echo $str,"=",strlen($str),"字节n";
getascill($str);

function getascill($str)
{
$arr=str_split($str);
foreach ($arr as $v)
{
echo $v,"=",ord($v),"n";
}
echo "=============rnrn";
}
?>

更多详细内容请查看:http://www.bKjia.c0m/phper/php-function/php-ord.htm

实例二

 代码如下 复制代码


/*
@ 另一种方法,使用ord()函数:
@ 适用于 gb2312 编码:
*/
$str = "怎么将新闻的很长的标题只显示前面一些字,后面用.....来代替?";
function gb2312_substr($str, $limit) {
$restr ='';
for($i=0;$i $restr .= ord($str[$i])>127 ? $str[$i].$str[++$i] : $str[$i];
}
return $restr;
}
/*
@ 以下仅适用于 utf-8 编码;
*/
function utf8_substr($str, $limit) {
$restr = '';
for($i=0;$i $restr .= ord($str[$i])>127 ? $str[$i].$str[++$i].$str[++$i] : $str[$i];
}
return $restr;
}
//解释下上面第一个:chr(0)不是null,null是什么都没有,而chr(0)的值是0。表示成16进制是0x00,表示成二进制是00000000虽然chr(0)不会显示出什么,但是他是一个字符。虽然chr(0)不会显示出什么,但是他是一个字符。当汉字被截断时,根据编码规则他总是要把后边的其他字符拉过来一起作为汉字解释,这就是出现乱码的原因。
?>

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