PHP上传进度条深度解析

if ($_SERVER['REQUEST_METHOD'] == 'POST') {  //上传请求
	$status = apc_fetch('upload_' . $_POST['APC_UPLOAD_PROGRESS']);
	$status['done'] = 1;
	echo json_encode($status);  //输出给用户端页面里的ajax调用，相关文档请自己寻找
	exit;
} elseif (isset($_GET['progress_key'])) {   //读取上传进度
	$status = apc_fetch('upload_'.$_GET['progress_key']);
	echo json_encode($status);
	exit;
}

if($_SERVER['REQUEST_METHOD']=='POST') {
	if (is_uploaded_file($_FILES['upfile']['tmp_name'])) {
		$upload_dir = 'your_path/';
		$ext        = strrchr($_FILES['video']['name'], '.');
		$sessid     = $_POST['UPLOAD_IDENTIFIER'] ;
		$tmpfile    = $upload_dir . $sessid;
		$sessfile   = $upload_dir . $sessid .$ext;
		if (move_uploaded_file($_FILES['upfile']['tmp_name'],$tmpfile)) {
			//上传成功
		}
	}
} elseif (!empty($_GET['sessid'])) {
	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");
	header("Content-Type:text/html;charset=UTF-8");
	$unique_id = $_GET['sessid'];
	$uploadvalues = uploadprogress_get_info($unique_id);
	if (is_array($uploadvalues)) {
		echo json_encode($uploadvalues);
	} else {
			//读取进度失败，另外处理逻辑
	}
}

static void uploadprogress_file_php_get_info(char * id, zval * return_value) {
	char s[1024];
	char * filename;
	char * template;
	FILE *F;
	TSRMLS_FETCH();
	template = INI_STR("uploadprogress.file.filename_template"); //这里读取设置好的模板
	if (strcmp(template, "") == 0) {
		return;
	} else {
		filename = uploadprogress_mk_filename( id, template );//存在的话，会创建
		if (!filename) return;
		F = VCWD_FOPEN(filename, "rb");
		if (F) {
			array_init(return_value);
			while ( fgets(s, 1000, F) ) {//从流中读取一字符串 *s结果数据的首地址；1000-1:一次读入数据块的长度,其默认值为1k，即1024;F文件指针
				char *k, *v, *e;
				int index = 0;
				e = strchr(s,'='); //查找字符串s中首次出现字符=的位置
				if (!e) continue;
				*e = 0; /* break the line into 2 parts */
				v = e+1;
				k = s;
				/* trim spaces in front of the name/value */
				while (*k && *k <= 32) k++;
				while (*v && *v <= 32) v++;
				/* trim spaces everywhere in the name */
				for (e=k; *e; e++) if (*e <= 32) { *e = 0; break; } 				/* trim spaces only at the end of the value */ 				/* http://pecl.php.net/bugs/bug.php?id=14525 */ 				//for (e=v; *e; e++) if (*e <= 32) { *e = 0; break; } 				if (v != NULL) { //当文件有内容时 					for (index = strlen(v); index > 0; index--) {
						if (v[index] > 32) break; //累计
						v[index] = 0;
					}
				}
				add_assoc_string( return_value, k, v, 1 );
			}
 
			fclose(F);
		}
	}
 
	if (filename) efree(filename);
	return;
}

PHP_MINIT_FUNCTION(uploadprogress)
{
	REGISTER_INI_ENTRIES();
	php_rfc1867_callback = uploadprogress_php_rfc1867_file;
	return SUCCESS;
}

upload_id = emalloc(strlen(*e_data->value) + 1);
strcpy(upload_id, *e_data->value);
progress->upload_id = upload_id;
progress->time_last  = time(NULL);
progress->speed_average  = 0;
progress->speed_last     = 0;
progress->bytes_uploaded = read_bytes;
progress->files_uploaded = 0;
progress->est_sec        = 0;
progress->identifier = uploadprogress_mk_filename(upload_id, template);//在指定的模板位置放下了临时文件
progress->identifier_tmp = emalloc(strlen( progress->identifier) + 4);
sprintf( progress->identifier_tmp, "%s.wr", progress->identifier );