JSON响应字符串以" null"结尾。

时间:2018-06-15 11:17:11

标签: php json wordpress rest wordpress-plugin-creation

在Postman和jQuery中,我都会以

的形式获得回复
{"key1": "value1", "key2": "value2"}null

那个尾随的null正在弄乱那些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error_log之前echo编码的JSON,那么没有尾随空值,所以我认为它是一个字符串终结符,但我并不认为PHP使用以null结尾的字符串。我如何摆脱这些空值?

正在编码并返回的对象:

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));

2 个答案:

答案 0 :(得分:1)

一旦PHP文件执行完毕,你必须手动退出或返回而不是回显,否则它会隐式返回NULL并弄乱一切。经验教训。

答案 1 :(得分:0)

可能不是最优雅的……但是这救了我:

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);
}