如何正确刷新 PHP 输出缓冲区？

debugcn 发表于 Dev

罗伯特·麦地那

我需要 PHP 将输出流式传输到 Javascript 但 Javascript 保留旧响应并像这样打印它们......

控制台日志：

[0]: Line to show.
[0]: Line to show.[1]: Line to show. 
[0]: Line to show.[1]: Line to show.[2]: Line to show.
[0]: Line to show.[1]: Line to show.[2]: Line to show.[3]: Line to show.
[0]: Line to show.[1]: Line to show.[2]: Line to show.[3]: Line to show.[4]: Line to show.

[0]: Line to show.[1]: Line to show.[2]: Line to show.[3]: Line to show.[4]: Line to show.Array
(
    [0] => [0]: Line to show.
    [1] => 
    [2] => 
    [3] => [1]: Line to show.
    [4] => 
    [5] => 
    [6] => [2]: Line to show.
    [7] => 
    [8] => 
    [9] => [3]: Line to show.
    [10] => 
    [11] => 
    [12] => [4]: Line to show.
    [13] => 
    [14] => 
)

因此 Javascript 控制台日志声明 responseText 正在“保存”旧响应。但是，看看我保存在PHP中的数组，您会发现以前没有任何回显都被刷新到JS。

Javascript：

                $.ajax({
                    url: "../controller/controller.php", 
                    type: "POST",
                    data: {operation: 'rxMode'},
                    xhr: function(){
                        var xhr = $.ajaxSettings.xhr();
                        xhr.onprogress = function(e){ console.log(e.currentTarget.responseText); };
                        console.log(xhr);
                        return xhr;
                    }
                 });

PHP：

        $out = array();
        for ($i = 0; $i<5; $i++){
            echo "[$i]: Line to show.";
            array_push($out, ob_get_contents());
            ob_flush();
            array_push($out, ob_get_contents());
            flush();
            array_push($out, ob_get_contents());
            sleep(2);
        }
        print_r($out);

我想要的 responseText 是

[0]: Line to show.
[1]: Line to show.
[2]: Line to show.
[3]: Line to show.
[4]: Line to show.

编辑：我不想删除旧的回复，而是希望 Javascript 只给我我想要的 responseText。

巴马

responseText始终包含来自服务器的整个响应。当您使用该progress事件时，它包含迄今为止累积的响应，而不仅仅是最近从服务器刷新添加到响应中的增量字符串。

将前一个响应文本的长度保存在一个变量中，然后在随后的调用中只打印之后的子字符串。

var responseLen = 0;
$.ajax({
    url: "../controller/controller.php", 
    type: "POST",
    data: {operation: 'rxMode'},
    xhr: function(){
        var xhr = $.ajaxSettings.xhr();
        xhr.onprogress = function(e){
            console.log(e.currentTarget.responseText.substr(responseLen)); 
            responseLen = e.currentTarget.responseText.length;
        };
        console.log(xhr);
        return xhr;
    }
 });

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