php 将 ASCII 转换为 UTF-8 编码

Convert ASCII TO UTF-8 Encoding

提问by user614856

How to convert ASCII encoding to UTF8 in PHP

如何在 PHP 中将 ASCII 编码转换为 UTF8

回答by Quentin

ASCII is a subset of UTF-8, so if a document is ASCII then it is already UTF-8.

ASCII 是 UTF-8 的子集，因此如果文档是 ASCII，那么它已经是 UTF-8。

回答by Dmitri

If you know for sure that your current encoding is pure ASCII, then you don't have to do anything because ASCII is already a valid UTF-8.

如果您确定您当前的编码是纯 ASCII，那么您无需执行任何操作，因为 ASCII 已经是有效的 UTF-8。

But if you still want to convert, just to be sure that its UTF-8, then you can use iconv

但是如果你仍然想转换，只是为了确定它的UTF-8，那么你可以使用iconv

$string = iconv('ASCII', 'UTF-8//IGNORE', $string);

The IGNORE will discard any invalid characters just in case some were not valid ASCII.

IGNORE 将丢弃任何无效字符，以防万一一些不是有效的 ASCII。

回答by albertoiNET

Use mb_convert_encodingto convert an ASCII to UTF-8. More info here

使用mb_convert_encoding将 ASCII 转换为 UTF-8。更多信息在这里

$string = "chárêct?rs";
print(mb_detect_encoding ($string));

$string = mb_convert_encoding($string, "UTF-8");
print(mb_detect_encoding ($string));

回答by Radek M

"ASCII is a subset of UTF-8, so..." - so UTF-8 is a set? :)

“ASCII 是 UTF-8 的子集，所以......” - 所以 UTF-8 是一个集合？:)

In other words: any string build with code pointsfrom x00 to x7F has indistinguishable representations(byte sequences) in ASCII and UTF-8. Converting such string is pointless.

换句话说：code points从 x00 到 x7F构建的任何字符串在 ASCII 和 UTF-8 中都具有无法区分的表示（字节序列）。转换这样的字符串是没有意义的。

回答by thomas

Use utf8_encode()

用 utf8_encode()

Man page can be found here http://php.net/manual/en/function.utf8-encode.php

手册页可以在这里找到http://php.net/manual/en/function.utf8-encode.php

Also read this article from Joel on Software. It provides an excellent explanation if what Unicode is and how it works. http://www.joelonsoftware.com/articles/Unicode.html

另请阅读 Joel 关于软件的这篇文章。它提供了一个很好的解释 Unicode 是什么以及它是如何工作的。http://www.joelonsoftware.com/articles/Unicode.html

回答by Marcin ?urek

Using iconv looks like best solution but i my case I have Notice form this function: "Detected an illegal character in input string in" (without igonore). I use 2 functions to manipulate ASCII strings convert it to array of ASCII code and then serialize:

使用 iconv 看起来是最好的解决方案，但我的情况是我有这个函数的通知：“在输入字符串中检测到一个非法字符”（没有 igonore）。我使用 2 个函数来操作 ASCII 字符串，将其转换为 ASCII 代码数组，然后序列化：

public static function ToAscii($string) {
    $strlen = strlen($string);
    $charCode = array();
    for ($i = 0; $i < $strlen; $i++) {
        $charCode[] = ord(substr($string, $i, 1));
    }
    $result = json_encode($charCode);
    return $result;
}

public static function fromAscii($string) {
    $charCode = json_decode($string);
    $result = '';
    foreach ($charCode as $code) {
        $result .= chr($code);
    };
    return $result;
}