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我的网站托管在 godaddy 上并在 php 上运行。我在使用分块上传文件时遇到问题。问题仅在于某些文件。一个这样的文件大小为 5.13 MB。我可以上传 20 MB 的更大文件，甚至更小的文件。问题只出在这个文件上。我检查了内容，内容没有问题。它是纯 .txt 文件。该文件以 6 个块上传，在第 6 个块中它给出 500 内部服务器错误。它能够成功处理分成大约 20 个块（每个块大小为 1 MB）的文件。我在 chrome 和 Edge 中尝试过，同样是问题所在。我正在使用以下 javascript 代码来分块和上传内容。我做了很多谷歌搜索，但我的问题似乎很独特，在任何地方都找不到解决方案。大多数答案都是指与文件大小相关的 500 错误。但正如我所提到的，我能够上传更大的文件。

function sendRequest() {
    for(var i=0; i<document.getElementById('file').files.length; i++) {
        var blob = document.getElementById('file').files[i];
        var BYTES_PER_CHUNK = 1048576;//100 * 1024 * 1024; // 1MB chunk sizes.
        //var BYTES_PER_CHUNK = 100 * 1024 * 1024; // 100MB chunk sizes.
        var SIZE = blob.size;
        var start = 0;
        var end = BYTES_PER_CHUNK;
        //alert(window["uploadcounter" + i]);
        window["uploadcounter" + i]=0;
        window["uploadfilearray" + i] = [];
        document.getElementById('uploadPercent' + i).innerHTML = "Upload: 0 % ";
        while( start < SIZE ) {
            var chunk = blob.slice(start, end);
            window["uploadfilearray" + i][window["uploadcounter" + i]]=chunk;
            window["uploadcounter" + i]=window["uploadcounter" + i]+1;
            start = end;
            end = start + BYTES_PER_CHUNK;
        }

        window["uploadcounter" + i]=0;
        uploadFile(window["uploadfilearray" + i][window["uploadcounter" + i]], document.getElementById('file').files[i].name, i);
//      setInterval(new function() {updateFileProcessingStatus(document.getElementById('file').files[i].name)}, 3000);
    }
}

var chunkNumber = 0;

function uploadFile(blobFile, filename, fileIndex) {
    alert(blobFile.size + '        chunknumber: ' + ++chunkNumber);

    var fd = new FormData();
    fd.append("fileToUpload", blobFile);

    var xhr = new XMLHttpRequest();



    xhr.addEventListener("load", uploadComplete, false);
    xhr.addEventListener("error", uploadFailed, false);
    xhr.addEventListener("abort", uploadCanceled, false);

    xhr.open("POST", "./datafileupload.php?filename="+filename + "&chunkNumber=" + chunkNumber + "&r=" + Math.random());

    xhr.onload = function(e) {
        window["uploadcounter" + fileIndex] = window["uploadcounter" + fileIndex] + 1;
        if(window["uploadfilearray" + fileIndex].length > window["uploadcounter" + fileIndex] ){
            uploadFile(window["uploadfilearray" + fileIndex][window["uploadcounter" + fileIndex]], filename, fileIndex); 
            var percentloaded2 = parseInt((window["uploadcounter" + fileIndex]/window["uploadfilearray" + fileIndex].length)*100);
            $('#uploadPercent' + fileIndex).html('Upload Percent : '+ filename + ' ' + percentloaded2+' % ');
            $('#progressbar' + fileIndex).attr('style', 'width:' + percentloaded2 + '%');
        }else{
            $('#progressbar' + fileIndex).attr('style', 'width: 100%');
            $('#uploadPercent' + fileIndex).html("File uploaded");
            processFile(filename);
        }
    };
    xhr.send(fd);

}

同样在另一边，以下是处理上传文件的 php 代码

<?php
    ini_set('max_execution_time', 10000); 
    require("dbconfig.php");
    ini_set('auto_detect_line_endings', true);
    if ((!isset($_SESSION['newsession']) || $_SESSION['newsession'] == false) && $_SESSION["ROLE"] == 'Admin'){
        $name2 = $_GET['filename'];
        echo "the chunk received is " . $_GET["chunkNumber"];

        $extension = end((explode(".", $name2)));
        if($extension != 'csv' || $extension != 'txt') {
            exit;
        }
        $lowerCaseName = strtolower($name2);
        $isValidCSV = 0;
        if(strpos($lowerCaseName, "gsa") !== false) {
            $isValidCSV = 1;
        } else if(strpos($lowerCaseName, "product") !== false) {
            $isValidCSV = 1;
        } else if(strpos($lowerCaseName, "image") !== false) {
            $isValidCSV = 1;
        } else if(strpos($lowerCaseName, "supplier") !== false) {
            $isValidCSV = 1;
        } else if(strpos($lowerCaseName, "account") !== false) {
            $isValidCSV = 1;
        }
        if($isValidCSV === 0) {
            exit;
        }
        $name = $_FILES['fileToUpload']['name'];
        $target_path = "./uploadedfiles/";
        $tmp_name = $_FILES['fileToUpload']['tmp_name'];

        $target_file = $target_path.$name;
        $complete =$target_path.$name2;
        $com = fopen($complete, "ab");
        error_log($target_path);

        // Open temp file
        //$out = fopen($target_file, "wb");

        //if ( $out ) {
            // Read binary input stream and append it to temp file
            $in = fopen($tmp_name, "rb");
            if ( $in ) {
                while($buff = fread( $in, 1048576 )) {
                    fwrite($com, $buff);
                }   
            }
            fclose($in);

        //}
        //fclose($out);
        fclose($com);
    }else{
        echo'you are not logged in.';
    }
?>
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