服務器上傳文件會有一定的限制。避免內存消耗過大影響性能，在 php.ini 配置文件中，有幾個影響參數：
upload_max_filesize = 2M //PHP最大能接受的文件大小 post_max_size = 8M //PHP能收到的最大POST值' memory_limit = 128M //內存上限 max_execution_time = 30 //最大執行時間
為了滿足需求，可適量調整配置參數。但遇到超大文件上傳，比如視頻時，就需要在技術層面解決這一問題。
以下利用 html5 可直接操作二進制文件的新特性，用 PHP + JS 實現將大文件分割上傳后再合並的辦法，實現大文件上傳。
前端代碼：
<!doctype html>
<head>
<title>slide-upload</title>
</head>
<body>
<input type="file" name="file" id="file">
<script>
var fileForm = document.getElementById("file");
var upload = new Upload();
fileForm.onchange = function(){
upload.addFileAndSend(this);
}
function Upload(){
var xhr = new XMLHttpRequest();
var form_data = new FormData();
const LENGTH = 1024 * 1024 * 1;
var start = 0;
var end = start + LENGTH;
var blob;
var blob_num = 1;
var is_stop = 0
//傳入文件對象
this.addFileAndSend = function(that){
var file = that.files[0];
blob = cutFile(file);
sendFile(blob,file);
blob_num += 1;
}
//切割文件
function cutFile(file){
var file_blob = file.slice(start,end);
start = end;
end = start + LENGTH;
return file_blob;
};
//發送文件
function sendFile(blob,file){
var total_blob_num = Math.ceil(file.size / LENGTH);
form_data.append('file',blob);
form_data.append('blob_num',blob_num);
form_data.append('total_blob_num',total_blob_num);
form_data.append('file_name',file.name);
xhr.open('POST','./slice_upload.php',true);
xhr.onreadystatechange = function () {
var progress;
if(total_blob_num == 1){
progress = '100%';
}else{
progress = Math.min(100,(blob_num/total_blob_num)* 100 ) +'%';
}
var t = setTimeout(function(){
if(start < file.size){
blob = cutFile(file);
sendFile(blob,file);
blob_num += 1;
}else{
setTimeout(t);
}
},1000);
}
xhr.send(form_data);
}
}
</script>
</body>
</html>
后台文件上傳代碼：
<?php //實例化並獲取系統變量傳參 $upload = new Upload($_FILES['file']['tmp_name'],$_POST['blob_num'],$_POST['total_blob_num'],$_POST['file_name']); //調用方法，返回結果 $upload->apiReturn(); class Upload{ private $filepath = './upload'; //上傳目錄 private $tmpPath; //PHP文件臨時目錄 private $blobNum; //第幾個文件塊 private $totalBlobNum; //文件塊總數 private $fileName; //文件名 public function __construct($tmpPath, $blobNum, $totalBlobNum, $fileName){ $this->tmpPath = $tmpPath; $this->blobNum = $blobNum; $this->totalBlobNum = $totalBlobNum; $this->fileName = $fileName; $this->moveFile(); $this->fileMerge(); } //判斷是否是最后一塊，如果是則進行文件合成並且刪除文件塊 private function fileMerge(){ if($this->blobNum == $this->totalBlobNum){ $blob = ''; for($i=1; $i<= $this->totalBlobNum; $i++){ $blob .= file_get_contents($this->filepath.'/'. $this->fileName.'__'.$i); } file_put_contents($this->filepath.'/'. $this->fileName,$blob); $this->deleteFileBlob(); } } //刪除文件塊 private function deleteFileBlob(){ for($i=1; $i<= $this->totalBlobNum; $i++){ @unlink($this->filepath.'/'. $this->fileName.'__'.$i); } } //移動文件 private function moveFile(){ $this->touchDir(); $filename = $this->filepath.'/'. $this->fileName.'__'.$this->blobNum; move_uploaded_file($this->tmpPath,$filename); } //API返回數據 public function apiReturn(){ if($this->blobNum == $this->totalBlobNum){ if(file_exists($this->filepath.'/'. $this->fileName)){ $data['code'] = 2; $data['msg'] = 'success'; $data['file_path'] = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['DOCUMENT_URI']).str_replace('.','',$this->filepath).'/'. $this->fileName; } }else{ if(file_exists($this->filepath.'/'. $this->fileName.'__'.$this->blobNum)){ $data['code'] = 1; $data['msg'] = 'waiting for all'; $data['file_path'] = ''; } } header('Content-type: application/json'); echo json_encode($data); } //建立上傳文件夾 private function touchDir(){ if(!file_exists($this->filepath)){ return mkdir($this->filepath); } } }
以上只是實現了簡單的上傳功能，很多情況下文件傳輸之前需要加密，或者實現端點傳輸。