如何使用PHP将所有字符转换为等效的html实体 [英] How to convert all characters to their html entity equivalent using PHP

问题描述

我想将此[e-mail]转换为

hello@domain.com

我尝试过:

url_encode($string)

这提供了我输入的相同字符串，并返回@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)

这在后面提供了相同的字符串.

this provides the same string right back.

我正在使用UTF8字符集.不知道这是否有所不同....

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

推荐答案

在这里就可以了(假设使用UTF-8，但是更改起来很简单):

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:推荐的替代方法，使用 unpack :

EDIT Recommended alternative using unpack:

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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