获取文件上传进度的方法很多，该文介绍的是使用session.upload_progress，，基于PHP 5.4以上版本的方法。
【1】文件php.ini 配置
根据实际情况进行设置
session.upload_progress.enabled[=1] : 是否启用上传进度报告(默认开启)session.upload_progress.cleanup[=1] : 是否在上传完成后及时删除进度数据(默认开启, 推荐开启).session.upload_progress.prefix[=upload_progress_] : 进度数据将存储在_SESSION[session.upload_progress.prefix . _POST[session.upload_progress.name]]session.upload_progress.name[=PHP_SESSION_UPLOAD_PROGRESS] : 如果_POST[session.upload_progress.name]没有被设置, 则不会报告进度.session.upload_progress.freq[=1%] : 更新进度的频率(已经处理的字节数), 也支持百分比表示’%’.session.upload_progress.min_freq[=1.0] : 更新进度的时间间隔(秒级)
;允许客户端单个POST请求发送的最大数据 Mpost_max_size=2048M;接受所有数据到开始执行脚本的最大时间 Smax_input_time=60;脚本的最大执行时间 Smax_execution_time=0;是否开启文件上传功能file_uploads = On;文件上传的临时目录upload_tmp_dir="C:\xampp\tmp";允许单个请求上传的最大文件大小 Mupload_max_filesize = 2048M;允许单个POST请求同时上传的最大文件数量max_file_uploads = 20
【2】 _FILES变量简介
$_FILES["file"]["name"] – 被上传文件的名称$_FILES["file"]["type"] – 被上传文件的类型$_FILES["file"]["size"] – 被上传文件的大小，以字节计$_FILES["file"]["tmp_name"] – 存储在服务器的文件的临时副本的名称$_FILES["file"]["error"] – 由文件上传导致的错误代码
【3】代码
文件上传表单
设置session.upload_progress.name key的值
<?phpif (version_compare(phpversion(), '5.4.0', '<'))exit('ERROR: Your PHP version is ' . phpversion() . ' but this script requires PHP 5.4.0 or higher.');if (!intval(ini_get('session.upload_progress.enabled')))exit('session.upload_progress.enabled is not enabled, please activate it in your PHP config file to use this script.');require_once ("upload.class.php");?><!doctype html><html><head><meta charset="utf-8"></head><body><form id="upload-form" action="upload.php" method="POST" enctype="multipart/form-data"> <!–设置session.upload_progress.name Key的值–> <input type="hidden" name="<?php echo ini_get("session.upload_progress.name"); ?>" value="<?php echo CUpload::UPLOAD_PROGRESS_PREFIX; ?>" /> <table> <tr> <td><input name="file1[]" type="file" align="right"/></td> <td><input type="submit" name="Submit" value="上传"/></td> </tr> </table> </form></body></html>
文件上传处理类
<?phpclass CUpload{const UPLOAD_PROGRESS_PREFIX = 'progress_bar';private $_sMsg, $_sUploadDir, $_sProgressKey;// The short array syntax (only for PHP 5.4.0 and higher)private $_aErrFile = [UPLOAD_ERR_OK=> 'There is no error, the file uploaded with success.',UPLOAD_ERR_INI_SIZE => 'The uploaded file exceeds the upload_max_filesize directive in php.ini.',UPLOAD_ERR_FORM_SIZE => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.',UPLOAD_ERR_PARTIAL => 'The uploaded file was only partially uploaded.',UPLOAD_ERR_NO_FILE => 'No file was uploaded.',UPLOAD_ERR_NO_TMP_DIR => 'Missing a temporary folder.',UPLOAD_ERR_CANT_WRITE => 'Failed to write file to disk.',UPLOAD_ERR_EXTENSION => 'A PHP extension stopped the file upload.'];public function __construct(){// Session initializationif ('' === session_id()) session_start();$this->_sUploadDir = 'uploads/';$this->_sProgressKey = strtolower(ini_get('session.upload_progress.prefix') . static::UPLOAD_PROGRESS_PREFIX);}public function __destruct(){if ('' !== session_id()){$_SESSION = array();session_destroy();}}/*** @return object this*/public function addFile(){if(!empty($_FILES)){$this->_sMsg = '';foreach($_FILES as $sKey => $aFiles){for($i = 0, $iNumFiles = count($aFiles['tmp_name']); $i < $iNumFiles; $i++){/*** 获取上传文件的参数*/$iErrCode = $aFiles['error'][$i];$iSize= $aFiles['size'][$i];$sFileName = $aFiles['name'][$i];$sTmpFile = $aFiles['tmp_name'][$i];$sFileDest = $this->_sUploadDir . $sFileName;$sTypeFile = $aFiles['type'][$i];/*** 检测文件类型*///$bIsImgExt = (strtolower(substr(strrchr($sFileName, '.'), 1))); // Get the file extension//if(($bIsImgExt == 'jpeg' || $bIsImgExt == 'jpg' || $bIsImgExt == 'png' || $bIsImgExt == 'gif') && (strstr($sTypeFile, '/', true) === 'image')){if($iErrCode == UPLOAD_ERR_OK){move_uploaded_file($sTmpFile, $sFileDest);$this->_sMsg .= '<p style="color:green; font-weight:bold; text-align:center">Successful "' . $sFileName . '" file upload!</p>';$this->_sMsg .= '<p style="text-align:center">Image type: ' . str_replace('image/', '', $sTypeFile) . '<br />';$this->_sMsg .= 'Size: ' . round($iSize / 1024) . ' KB<br />';$this->_sMsg .= '<a href="' . $sFileDest . '" title="Click here to see the original file" target="_blank"><img src="' . $sFileDest . '" alt="' . $sFileName . '" width="300" height="250" style="border:1.5px solid #ccc; border-radius:5px" /></a></p>';}else{$this->_sMsg .= '<p style="color:red; font-weight:bold; text-align:center">Error while downloading the file "' . $sFileName . '"<br />';$this->_sMsg .= 'Error code: "' . $iErrCode . '"<br />';$this->_sMsg .= 'Error message: "' . $this->_aErrFile[$iErrCode] . '"</p>';}}//else{// $this->_sMsg .= '<p style="color:red; font-weight:bold; text-align:center">File type incompatible. Please save the image in .jpg, .jpeg, .png or .gif</p>';}}}}else{$this->_sMsg = '<p style="color:red; font-weight:bold; text-align:center">You must select at least one file before submitting the form.</p>';}return $this;}/*** 中断文件上传** @return object this*/public function cancel(){if (!empty($_SESSION[$this->_sProgressKey]))$_SESSION[$this->_sProgressKey]['cancel_upload'] = true;return $this;}/*** @return 上传进度*/public function progress(){if(!empty($_SESSION[$this->_sProgressKey])){$aData = $_SESSION[$this->_sProgressKey];$iProcessed = $aData['bytes_processed'];$iLength = $aData['content_length'];$iProgress = ceil(100*$iProcessed / $iLength);}else{$iProgress = 100;}return $iProgress;}/*** @return object this*/public function show(){ob_start();echo '<p><strong>$_FILES Result:</strong></p><pre>';var_dump($_FILES);echo '</pre>';echo '<p><strong>$_SESSION Result:</strong></p><pre>';var_dump($_SESSION);echo '</pre>';$this->_sMsg = ob_get_clean();return $this;}/*** Get the JSON informational message.** @param integer $iStatus, 1 = success, 0 = error* @param string $sTxt* @return string JSON Format.*/public static function jsonMsg($iStatus, $sTxt){return '{"status":' . $iStatus . ',"txt":"' . $sTxt . '"}';}/*** Get the informational message.** @return string*/public function __toString(){return $this->_sMsg;}}
执行文件上传操作
我们什么都没有，唯一的本钱就是青春。
