PHP文件上传带进度条

2024-09-04 11:45:06

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实现篇:

一般情况,用php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,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:

if ($_server['request_method'] == ‘post’) {  //上传请求

$status = apc_fetch(’upload_’ . $_post['apc_upload_progress']);

$status['done'] = 1;//开源代码Vevb.com

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.关键代码如下:

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 (!emptyempty($_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进行源码分析,在代码中作了注释,代码如下:

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://111cn.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;

}

}

在源码中还能发现如下代码:

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:

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 );