PHP文件打开/读取/创建/写入实例教程

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PHP 文件打开/读取/创建/写入

下面这个脚本摘自于plupload-2.13源码中的demo。

/**

* upload.php

*

* Copyright 2013, Moxiecode Systems AB

* Released under GPL License.

*

* License: https://www.plupload.com/license

* Contributing: https://www.plupload.com/contributing

*/

#!! IMPORTANT:

#!! this file is just an example, it doesn't incorporate any security checks and

#!! is not recommended to be used in production environment as it is. Be sure to

#!! revise it and customize to your needs.

// Make sure file is not cached (as it happens for example on iOS devices)

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");

header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");

header("Cache-Control: no-store, no-cache, must-revalidate");

header("Cache-Control: post-check=0, pre-check=0", false);

header("Pragma: no-cache");

/*

// Support CORS

header("Access-Control-Allow-Origin: *");

// other CORS headers if any...

if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {

exit; // finish preflight CORS requests here

}

*/

// 5 minutes execution time

@set_time_limit(5 * 60);

// Uncomment this one to fake upload time

// usleep(5000);

// Settings

$targetDir = ini_get("upload_tmp_dir") . DIRECTORY_SEPARATOR . "plupload";

//$targetDir = 'uploads';

$cleanupTargetDir = true; // Remove old files

$maxFileAge = 5 * 3600; // Temp file age in seconds

/* 服务器端接受plupload上传的文件，保存在临时目录的最长时间是$maxFileAge;时间到这个文件自动删除; */

// Create target dir

if (!file_exists($targetDir)) {

@mkdir($targetDir);

}

// Get a file name

if (isset($_REQUEST["name"])) {

$fileName = $_REQUEST["name"];

} elseif (!empty($_FILES)) {

$fileName = $_FILES["file"]["name"];

} else {

$fileName = uniqid("file_");

}

$filePath = $targetDir . DIRECTORY_SEPARATOR . $fileName;

// Chunking might be enabled

$chunk = isset($_REQUEST["chunk"]) ? intval($_REQUEST["chunk"]) : 0;

$chunks = isset($_REQUEST["chunks"]) ? intval($_REQUEST["chunks"]) : 0;

// Remove old temp files

if ($cleanupTargetDir) {

if (!is_dir($targetDir) || !$dir = opendir($targetDir)) {

die('{"jsonrpc" : "2.0", "error" : {"code": 100, "message": "Failed to open temp directory."}, "id" : "id"}');

}

while (($file = readdir($dir)) !== false) {

$tmpfilePath = $targetDir . DIRECTORY_SEPARATOR . $file;

// If temp file is current file proceed to the next

if ($tmpfilePath == "{$filePath}.part") {

continue;

}

// Remove temp file if it is older than the max age and is not the current file

if (preg_match('/\.part$/', $file) && (filemtime($tmpfilePath) < time() - $maxFileAge)) {

@unlink($tmpfilePath);

}

}

closedir($dir);

}

// Open temp file

if (!$out = @fopen("{$filePath}.part", $chunks ? "ab" : "wb")) {

die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');

}

if (!empty($_FILES)) {

if ($_FILES["file"]["error"] || !is_uploaded_file($_FILES["file"]["tmp_name"])) {

die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file."}, "id" : "id"}');

}

// Read binary input stream and append it to temp file

if (!$in = @fopen($_FILES["file"]["tmp_name"], "rb")) {

die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');

}

} else {

if (!$in = @fopen("php://input", "rb")) {

die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');

}

}

while ($buff = fread($in, 4096)) {

fwrite($out, $buff);

}

@fclose($out);

@fclose($in);

// Check if file has been uploaded

if (!$chunks || $chunk == $chunks - 1) {

// Strip the temp .part suffix off

rename("{$filePath}.part", $filePath);

}

// Return Success JSON-RPC response

die('{"jsonrpc" : "2.0", "result" : null, "id" : "id"}');