我可以使用 php 获取字符的 unicode 值，反之亦然吗？
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can I get the unicode value of a character or vise versa with php?
提问by Totoro
Is it possible to input a character and get the unicode value back? for example, i can put ⽇ in html to output "?", is it possible to give that character as an argument to a function and get the number as an output without building a unicode table?
是否可以输入一个字符并取回 unicode 值？例如，我可以将 ⽇ 放入 html 中以输出“？”，是否可以将该字符作为函数的参数并在不构建 unicode 表的情况下获取数字作为输出？
$val = someFunction("?");//returns 12103
or the reverse?
还是相反？
$val2 = someOtherFunction(12103);//returns "?"
I would like to be able to output the actual characters to the page not the codes, and I would also like to be able to get the code from the character if possible. The closest I got to what I want is php.net/manual/en/function.mb-decode-numericentity.php but I cant get it working, is this the code I need or am I on the wrong track?
我希望能够将实际字符输出到页面而不是代码，如果可能的话，我也希望能够从字符中获取代码。我最接近我想要的是 php.net/manual/en/function.mb-decode-numericentity.php 但我无法让它工作，这是我需要的代码还是我走错了路？
回答by Mark Baker
function _uniord($c) {
if (ord($c{0}) >=0 && ord($c{0}) <= 127)
return ord($c{0});
if (ord($c{0}) >= 192 && ord($c{0}) <= 223)
return (ord($c{0})-192)*64 + (ord($c{1})-128);
if (ord($c{0}) >= 224 && ord($c{0}) <= 239)
return (ord($c{0})-224)*4096 + (ord($c{1})-128)*64 + (ord($c{2})-128);
if (ord($c{0}) >= 240 && ord($c{0}) <= 247)
return (ord($c{0})-240)*262144 + (ord($c{1})-128)*4096 + (ord($c{2})-128)*64 + (ord($c{3})-128);
if (ord($c{0}) >= 248 && ord($c{0}) <= 251)
return (ord($c{0})-248)*16777216 + (ord($c{1})-128)*262144 + (ord($c{2})-128)*4096 + (ord($c{3})-128)*64 + (ord($c{4})-128);
if (ord($c{0}) >= 252 && ord($c{0}) <= 253)
return (ord($c{0})-252)*1073741824 + (ord($c{1})-128)*16777216 + (ord($c{2})-128)*262144 + (ord($c{3})-128)*4096 + (ord($c{4})-128)*64 + (ord($c{5})-128);
if (ord($c{0}) >= 254 && ord($c{0}) <= 255) // error
return FALSE;
return 0;
} // function _uniord()
and
和
function _unichr($o) {
if (function_exists('mb_convert_encoding')) {
return mb_convert_encoding('&#'.intval($o).';', 'UTF-8', 'HTML-ENTITIES');
} else {
return chr(intval($o));
}
} // function _unichr()
回答by bobince
Here's a more compact implementation of unichr/uniord based on pack:
这是一个基于 unichr/uniord 的更紧凑的实现pack：
// code point to UTF-8 string
function unichr($i) {
return iconv('UCS-4LE', 'UTF-8', pack('V', $i));
}
// UTF-8 string to code point
function uniord($s) {
return unpack('V', iconv('UTF-8', 'UCS-4LE', $s))[1];
}
回答by MAChitgarha
If you're using PHP7.2 (or later), you don't need to define a new function. There are two functions for your purposes from Multibyte String extension!
如果您使用的是 PHP7.2（或更高版本），则不需要定义新函数。多字节字符串扩展中有两个功能可用于您的目的！
To get code point of a character (i.e. Unicode value), use mb_ord(); and to get a specific character from that value, use mb_chr().
要获取字符的代码点（即 Unicode 值），请使用mb_ord()；并从该值中获取特定字符，请使用mb_chr()。
E.g.:
例如：
mb_chr(12103, "utf8"); // ?
mb_ord("?", "utf8"); // 12103
回答by user23127
This also works, (for someone who understands bitshifting this might be more readable than Mark Bakers answer):
这也有效，（对于了解位移的人来说，这可能比 Mark Bakers 的回答更具可读性）：
public function ordinal($str){
$charString = mb_substr($str, 0, 1, 'utf-8');
$size = strlen($charString);
$ordinal = ord($charString[0]) & (0xFF >> $size);
//Merge other characters into the value
for($i = 1; $i < $size; $i++){
$ordinal = $ordinal << 6 | (ord($charString[$i]) & 127);
}
return $ordinal;
}
回答by Akhil Thayyil
You can use the following functions
您可以使用以下功能
For encoding
用于编码
string utf8_encode ( string $data )
http://php.net/manual/en/function.utf8-encode.php
http://php.net/manual/en/function.utf8-encode.php
For decoding
解码用
string utf8_decode ( string $data )
http://php.net/manual/en/function.utf8-decode.php
http://php.net/manual/en/function.utf8-decode.php
Also check
还要检查
http://php.net/manual/en/function.htmlspecialchars.php
http://php.net/manual/en/function.htmlspecialchars.php
<?php
echo htmlspecialchars_decode("⽇");//will print ?
?>
