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Using ord in php to intercept Chinese strings and solve the problem of garbled characters_PHP tutorial

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Below we give two examples, both of which use ord to judge character ascii to avoid the problem of Chinese garbled characters. For the function of this function, we can refer to http://www.bKjia.c0m/phper/php/41030. htm article, which gives a good introduction to the use of this function.

The code is as follows

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";
}
?>

Copy code

//a character
$str=(pack("a*", "China"));
echo $str,"=",strlen($str),"byte n";
getascill($str);
//h character
$str=(pack("h*", "fffe"));
echo $str,"=",strlen($str),"byte n";
getascill($str);
//c character
$str=(pack("c*", "55","56","57"));
echo $str,"=",strlen($str),"byte n";
getascill($str);

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< $limit-3;$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< $limit-3;$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。
?>

//i character short integer 32 bits 4 bytes 64 bits 8 bytes
$str=(pack("i", "100"));
echo $str,"=",strlen($str),"byte n";
getascill($str); //s character short integer 2 bytes
$str=(pack("s", "100"));
echo $str,"=",strlen($str),"byte n";
getascill($str); //l character long integer 4 bytes
$str=(pack("l", "100"));
echo $str,"=",strlen($str),"byte n";
getascill($str);

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