使用json_encode生成JSON出现奇怪字符问题求助

问题分析 #

你遇到的奇怪字符主要来自两个核心原因：

1. 输入的HTML字符串处于HTML实体编码状态（比如<、"），DOMDocument加载后未正确解析这些实体，导致文本残留异常转义内容；
2. 遍历DOM节点时捕获到大量含冗余空白（换行、制表符、连续空格）的文本节点，这些空白被JSON编码后显示为奇怪的转义字符或无效空白。

解决方案 #

1. 先解码HTML实体 #

将输入的实体编码HTML转换为真实HTML内容，再交给DOMDocument处理：

$htmlString = htmlspecialchars_decode($htmlString);

2. 强制DOMDocument使用UTF-8编码加载 #

避免编码不匹配导致的字符乱码问题：

$dom = new \DOMDocument();
libxml_use_internal_errors(true);
// 加入UTF-8声明，确保DOM解析编码一致
$dom->loadHTML('<?xml encoding="UTF-8">' . $htmlString);

3. 清理文本节点的冗余空白 #

过滤纯空白节点，同时将文本中的连续空白（换行、制表符等）压缩为单个空格：

foreach ($section->childNodes as $childNode)
{ 
    // 清理冗余空白：trim去除首尾空白，正则替换连续空白为单个空格
    $nodeValue = trim(preg_replace('/\s+/', ' ', $childNode->nodeValue)); 

    if (empty($nodeValue))
    {
        continue; 
    }

    $count++;
    $key = $keyPattern.'Text'.$count;
    $newArray[$key] = $nodeValue;
}

4. 优化JSON编码（可选） #

若仍有特殊字符问题，补充JSON_UNESCAPED_SLASHES参数避免斜杠被转义：

Storage::disk('public')->put(
    $fileName, 
    json_encode($newArray, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES)
);

修改后的完整代码 #

$htmlString = '<section>
        <h2>CCPA Privacy Notice Addendum</h2>
        <p>This California Consumer Privacy Act (CCPA) Privacy Notice Addendum supplements the information provided in the [App Name] Privacy Policy and applies solely to residents of the State of California ("consumers" or "you"). We adopt this addendum to comply with the CCPA and provide you with the required information about your rights under the CCPA.</p>
    </section>';

// 解码HTML实体
$htmlString = htmlspecialchars_decode($htmlString);
        
$dom = new \DOMDocument();
libxml_use_internal_errors(true);
// 指定UTF-8编码加载HTML
$dom->loadHTML('<?xml encoding="UTF-8">' . $htmlString);

$count = 0;
$keyPattern = 'ccpaRights';
$newArray = [];

foreach ($dom->getElementsByTagName('section') as $section)
{
    foreach ($section->childNodes as $childNode)
    { 
        $nodeValue = trim(preg_replace('/\s+/', ' ', $childNode->nodeValue)); 

        if (empty($nodeValue))
        {
            continue; 
        }

        $count++;
        $key = $keyPattern.'Text'.$count;
        $newArray[$key] = $nodeValue;
    }
}

$fileName = '/temp/translated-'.rand(1,1000).'.json';
Storage::disk('public')->put(
    $fileName, 
    json_encode($newArray, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES)
);

内容的提问来源于stack exchange，提问作者gabogabans