如何使用 PHP 将所有字符转换为等效的 html 实体

2021-12-28 00:00:00 string utf-8 encode php html-entities

我想把这个 hello@domain.com 转换成

I want to convert this hello@domain.com to 

hello@domain.com

我试过了:

url_encode($string)

这提供了我输入的相同字符串，返回时将@ 符号转换为 %40

this provides the same string I entered, returned with the @ symbol converted to %40

也尝试过:

htmlentities($string)

这提供了相同的字符串.

this provides the same string right back.

我使用的是 UTF8 字符集.不知道这是否有所作为....

I am using a UTF8 charset. not sure if this makes a difference....

推荐答案

就这样(假设是 UTF-8，但更改起来很简单):

Here it goes (assumes UTF-8, but it's trivial to change):

function encode($str) {
    $str = mb_convert_encoding($str , 'UTF-32', 'UTF-8'); //big endian
    $split = str_split($str, 4);

    $res = "";
    foreach ($split as $c) {
        $cur = 0;
        for ($i = 0; $i < 4; $i++) {
            $cur |= ord($c[$i]) << (8*(3 - $i));
        }
        $res .= "&#" . $cur . ";";
    }
    return $res;
}

编辑推荐使用unpack的替代方法::>

function encode2($str) {
    $str = mb_convert_encoding($str , 'UTF-32', 'UTF-8');
    $t = unpack("N*", $str);
    $t = array_map(function($n) { return "&#$n;"; }, $t);
    return implode("", $t);
}

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