PHP文件上传带进度条

作者：袖梨 2022-06-24

实现篇
一般情况，用php教程实现上传进度条就下面两种方法：
1.apc扩展（作者是php教程的创始人，5.2后php已经加入apc扩展）
2.pecl扩展模块 uploadprogress
不论是apc还是uploadprogress，都需要编译源码教程，因为原有的php函数根本不可能读取到临时文件夹里的东西。下面来看如何使用以及关键的代码：apc实现方法:
1.安装apc
2.配置php.ini，设置参数 apc.rfc1867=1
3.关键代码：

 代码如下 复制代码

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;
}

uploadprogress实现方法：
1.使用pecl 安装uploadprogress
2.php.ini里面设置 uploadprogress.file.filename_template = “/tmp/upd_%s.txt”
3.关键代码：

 代码如下 复制代码
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
}
}

 

 

 

 代码如下 复制代码
} 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
}
}


二. 原理篇
注意上一篇中的红色函数。
下载到uploadprogress1.0.1进行源码教程分析，在代码中作了注释。

 代码如下 复制代码
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://111com.net */
//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;
}
}

 

 

 

在源码中还能发现:

 代码如下 复制代码
php_minit_function(uploadprogress)
{
register_ini_entries();
php_rfc1867_callback = uploadprogress_php_rfc1867_file;
return success;
}

在minit中修改了php_rfc1867_callback，抽取uploadprogress_php_rfc1867_file的关键代码：

 代码如下 复制代码

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 );

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