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phpfensi.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 (! empty 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 );声明：本文来自网络，不代表【好得很程序员自学网】立场，转载请注明出处：http://www.haodehen.cn/did29420