JSON 响应字符串以 "null" 结尾

JSON response string ends with "null"

在 Postman 和 jQuery 中,我收到的回复都是

{"key1": "value1", "key2": "value2"}null

尾随的 null 干扰了任何试图在客户端解析它的东西,我无法弄清楚它来自哪里。如果我在 echo 之前 error_log 编码 JSON ,则没有尾随空值,所以我认为它是一个字符串终止符,但我不认为 PHP 使用以 null 结尾的字符串。我如何摆脱这些空值?

正在编码和 returned 的对象:

public function jsonSerialize()
{
    return [
        'internal_id' => $this->internal_id, //int
        'friendly_name' => $this->friendly_name, //string
        'external_id' => $this->external_id, //string
        'picture' => $this->picture //string
    ];
}

实际的 return 语句只是 echo(json_encode($retval));

一旦 PHP 文件执行完毕,你必须手动退出或 return 而不是回显,否则它会 return NULL 隐含地把一切搞砸.吸取教训。

可能不是最优雅的...但这救了我:

function removeTrailingNulls(__str){
    var sanitized = __str;
    var lastCharIndex = sanitized.length - 1;
    var lastChar = sanitized[lastCharIndex];
    var lastCharCode = lastChar.charCodeAt(0);
    var isWeirdNullSpace = lastCharCode === 0; 
    console.log('checking last char (' + lastChar + ') code: ' + lastCharCode + '...null space end?' + isWeirdNullSpace);
    var loopCount = 0;
    while(isWeirdNullSpace){
        sanitized = sanitized.substring(0, sanitized.length-1);
        lastChar = sanitized[sanitized.length-1];
        lastCharCode = lastChar.charCodeAt(0);
        isWeirdNullSpace = lastCharCode === 0;              
        loopCount++;
        if(loopCount>100) break; // prevent infinite loops just in case.
    }
    return String(sanitized);
}