上传文件，提示文件不存在的解决方法
在做公司的一个项目中，需要上传文件，使用的是AjaxUpload JS组件，选择完文件后，发送请求到指定接口，随即返回服务器上文件的相对路径，然后PHP再做其他工作（这不是重点）
处理上传的PHP程序，限制其文件大小为20M
php.ini中
post_max_size 20M
upload_max_filesize 20M
memory_limit 256M
ngint.conf中
client_max_body_size 518M
上传20M以下的文件，没有问题，但是，例如上传80M的文件，会报错，文件不存在，
if ( ! isset($_FILES[$field]))
{
$this->set_error('upload_no_file_selected');
return FALSE;
}
网上的解决方法是 设置 php.ini和nginx.conf中相应的属性，仍然报错，后来参考了鸟哥的一篇文章，才找到原因
解决方法:
php.ini中的post_max_size和upload_max_filesize 的值要大些，不能仅限于规定的值，比如这个20M，根据情况，这里设置200M，再次上传80M的文件，根据PHP程序本身的 $_FILES['file']['error'] 可得出 文件大小 超过限制 这样的提示
- SAPI_API SAPI_POST_HANDLER_FUNC(rfc1867_post_handler)
- {
- char *boundary, *s=NULL, *boundary_end = NULL, *start_arr=NULL, *array_index=NULL;
- char *temp_filename=NULL, *lbuf=NULL, *abuf=NULL;
- int boundary_len=0, total_bytes=0, cancel_upload=0, is_arr_upload=0, array_len=0;
- int max_file_size=0, skip_upload=0, anonindex=0, is_anonymous;
- zval *http_post_files=NULL; HashTable *uploaded_files=NULL;
- #if HAVE_MBSTRING && !defined(COMPILE_DL_MBSTRING)
- int str_len = 0, num_vars = 0, num_vars_max = 2*10, *len_list = NULL;
- char **val_list = NULL;
- #endif
- zend_bool magic_quotes_gpc;
- multipart_buffer *mbuff;
- zval *array_ptr = (zval *) arg;
- int fd=-1;
- zend_llist header;
- void *event_extra_data = NULL;
- int llen = 0;
- /**
- *检查是否超出最大上传文件大小，这是重点
- *从request_global中取出request_info结构体中的content_length元素，这个content_length应该是http 头信息中发给服务器的
- *如果content_length 大于php.ini中设置的post_max_size,就会由sapi_errror触发一个warning,这个warning不会被php接受（还有待研究）
- *通过nginx的log日志中也能发现此warning
- *
- */
- if (SG(request_info).content_length > SG(post_max_size)) {
- sapi_module.sapi_error(E_WARNING, "POST Content-Length of %ld bytes exceeds the limit of %ld bytes", SG(request_info).content_length, SG(post_max_size));
- return;
- }
- //取得上传文件的分隔符
- boundary = strstr(content_type_dup, "boundary");
- if (!boundary || !(boundary=strchr(boundary, '='))) {
- sapi_module.sapi_error(E_WARNING, "Missing boundary in multipart/form-data POST data");
- return;
- }
- boundary++;
- boundary_len = strlen(boundary);
- if (boundary[0] == '"') {
- boundary++;
- boundary_end = strchr(boundary, '"');
- if (!boundary_end) {
- sapi_module.sapi_error(E_WARNING, "Invalid boundary in multipart/form-data POST data");
- return;
- }
- } else {
- /* search for the end of the boundary */
- boundary_end = strchr(boundary, ',');
- }
- if (boundary_end) {
- boundary_end[0] = '';
- boundary_len = boundary_end-boundary;
- }
- /* Initialize the buffer */
- if (!(mbuff = multipart_buffer_new(boundary, boundary_len))) {
- sapi_module.sapi_error(E_WARNING, "Unable to initialize the input buffer");
- return;
- }
- //初始化$_FILE变量
- zend_hash_init(&PG(rfc1867_protected_variables), 5, NULL, NULL, 0);
- ALLOC_HASHTABLE(uploaded_files);
- zend_hash_init(uploaded_files, 5, NULL, (dtor_func_t) free_estring, 0);
- SG(rfc1867_uploaded_files) = uploaded_files;
- ALLOC_ZVAL(http_post_files);
- array_init(http_post_files);
- INIT_PZVAL(http_post_files);
- PG(http_globals)[TRACK_VARS_FILES] = http_post_files; //TRACK_VARS_FILE正是_FILE在php_core_globals.http_globals中的index (注1)
- #if HAVE_MBSTRING && !defined(COMPILE_DL_MBSTRING)
- if (php_mb_encoding_translation(TSRMLS_C)) {
- val_list = (char **)ecalloc(num_vars_max+2, sizeof(char *));
- len_list = (int *)ecalloc(num_vars_max+2, sizeof(int));
- }
- #endif
- zend_llist_init(&header, sizeof(mime_header_entry), (llist_dtor_func_t) php_free_hdr_entry, 0);
- if (php_rfc1867_callback != NULL) {
- multipart_event_start event_start;
- event_start.content_length = SG(request_info).content_length;
- if (php_rfc1867_callback(MULTIPART_EVENT_START, &event_start, &event_extra_data TSRMLS_CC) == FAILURE) {
- goto fileupload_done;
- }
- }
- while (!multipart_buffer_eof(mbuff TSRMLS_CC))
- {
- char buff[FILLUNIT];
- char *cd=NULL,*param=NULL,*filename=NULL, *tmp=NULL;
- size_t blen=0, wlen=0;
- off_t offset;
- zend_llist_clean(&header);
- if (!multipart_buffer_headers(mbuff, &header TSRMLS_CC)) {
- goto fileupload_done;
- }
- if ((cd = php_mime_get_hdr_value(header, "Content-Disposition"))) {
- char *pair=NULL;
- int end=0;
- while (isspace(*cd)) {
- ++cd;
- }
- while (*cd && (pair = php_ap_getword(&cd, ';')))
- {
- char *key=NULL, *word = pair;
- while (isspace(*cd)) {
- ++cd;
- }
- if (strchr(pair, '=')) {
- key = php_ap_getword(&pair, '=');
- if (!strcasecmp(key, "name")) {
- if (param) {
- efree(param);
- }
- param = php_ap_getword_conf(&pair TSRMLS_CC);
- } else if (!strcasecmp(key, "filename")) {
- if (filename) {
- efree(filename);
- }
- filename = php_ap_getword_conf(&pair TSRMLS_CC);
- }
- }
- if (key) {
- efree(key);
- }
- efree(word);
- }
- /* Normal form variable, safe to read all data into memory */
- if (!filename && param) {
- unsigned int value_len;
- char *value = multipart_buffer_read_body(mbuff, &value_len TSRMLS_CC);
- unsigned int new_val_len; /* Dummy variable */
- if (!value) {
- value = estrdup("");
- }
- if (sapi_module.input_filter(PARSE_POST, param, &value, value_len, &new_val_len TSRMLS_CC)) {
- if (php_rfc1867_callback != NULL) {
- multipart_event_formdata event_formdata;
- size_t newlength = 0;
- event_formdata.post_bytes_processed = SG(read_post_bytes);
- event_formdata.name = param;
- event_formdata.value = &value;
- event_formdata.length = new_val_len;
- event_formdata.newlength = &newlength;
- if (php_rfc1867_callback(MULTIPART_EVENT_FORMDATA, &event_formdata, &event_extra_data TSRMLS_CC) == FAILURE) {
- efree(param);
- efree(value);
- continue;
- }
- new_val_len = newlength;
- }
- #if HAVE_MBSTRING && !defined(COMPILE_DL_MBSTRING)
- if (php_mb_encoding_translation(TSRMLS_C)) {
- php_mb_gpc_stack_variable(param, value, &val_list, &len_list,
- &num_vars, &num_vars_max TSRMLS_CC);
- } else {
- safe_php_register_variable(param, value, new_val_len, array_ptr, 0 TSRMLS_CC);
- }
- #else
- safe_php_register_variable(param, value, new_val_len, array_ptr, 0 TSRMLS_CC);
- #endif
- } else if (php_rfc1867_callback != NULL) {
- multipart_event_formdata event_formdata;
- event_formdata.post_bytes_processed = SG(read_post_bytes);
- event_formdata.name = param;
- event_formdata.value = &value;
- event_formdata.length = value_len;
- event_formdata.newlength = NULL;
- php_rfc1867_callback(MULTIPART_EVENT_FORMDATA, &event_formdata, &event_extra_data TSRMLS_CC);
- }
- if (!strcasecmp(param, "MAX_FILE_SIZE")) {
- max_file_size = atol(value);
- }
- efree(param);
- efree(value);
- continue;
- }
- /* If file_uploads=off, skip the file part */
- if (!PG(file_uploads)) {
- skip_upload = 1;
- }
- /* Return with an error if the posted data is garbled */
- if (!param && !filename) {
- sapi_module.sapi_error(E_WARNING, "File Upload Mime headers garbled");
- goto fileupload_done;
- }
- if (!param) {
- is_anonymous = 1;
- param = emalloc(MAX_SIZE_ANONNAME);
- snprintf(param, MAX_SIZE_ANONNAME, "%u", anonindex++);
- } else {
- is_anonymous = 0;
- }
- /* New Rule: never repair potential malicious user input */
- if (!skip_upload) {
- char *tmp = param;
- long c = 0;
- while (*tmp) {
- if (*tmp == '[') {
- c++;
- } else if (*tmp == ']') {
- c--;
- if (tmp[1] && tmp[1] != '[') {
- skip_upload = 1;
- break;
- }
- }
- if (c < 0) {
- skip_upload = 1;
- break;
- }
- tmp++;
- }
- }
- total_bytes = cancel_upload = 0;
- if (!skip_upload) {
- /* Handle file */
- fd = php_open_temporary_fd_ex(PG(upload_tmp_dir), "php", &temp_filename, 1 TSRMLS_CC);
- if (fd==-1) {
- sapi_module.sapi_error(E_WARNING, "File upload error - unable to create a temporary file");
- cancel_upload = UPLOAD_ERROR_E;
- }
- }
- if (!skip_upload && php_rfc1867_callback != NULL) {
- multipart_event_file_start event_file_start;
- event_file_start.post_bytes_processed = SG(read_post_bytes);
- event_file_start.name = param;
- event_file_start.filename = &filename;
- if (php_rfc1867_callback(MULTIPART_EVENT_FILE_START, &event_file_start, &event_extra_data TSRMLS_CC) == FAILURE) {
- if (temp_filename) {
- if (cancel_upload != UPLOAD_ERROR_E) { /* file creation failed */
- close(fd);
- unlink(temp_filename);
- }
- efree(temp_filename);
- }
- temp_filename="";
- efree(param);
- efree(filename);
- continue;
- }
- }
- if (skip_upload) {
- efree(param);
- efree(filename);
- continue;
- }
- if(strlen(filename) == 0) {
- #if DEBUG_FILE_UPLOAD
- sapi_module.sapi_error(E_NOTICE, "No file uploaded");
- #endif
- cancel_upload = UPLOAD_ERROR_D;
- }
- offset = 0;
- end = 0;
- while (!cancel_upload && (blen = multipart_buffer_read(mbuff, buff, sizeof(buff), &end TSRMLS_CC)))
- {
- if (php_rfc1867_callback != NULL) {
- multipart_event_file_data event_file_data;
- event_file_data.post_bytes_processed = SG(read_post_bytes);
- event_file_data.offset = offset;
- event_file_data.data = buff;
- event_file_data.length = blen;
- event_file_data.newlength = &blen;
- if (php_rfc1867_callback(MULTIPART_EVENT_FILE_DATA, &event_file_data, &event_extra_data TSRMLS_CC) == FAILURE) {
- cancel_upload = UPLOAD_ERROR_X;
- continue;
- }
- }
- if (PG(upload_max_filesize) > 0 && total_bytes > PG(upload_max_filesize)) {
- #if DEBUG_FILE_UPLOAD
- sapi_module.sapi_error(E_NOTICE, "upload_max_filesize of %ld bytes exceeded - file [%s=%s] not saved", PG(upload_max_filesize), param, filename);
- #endif
- cancel_upload = UPLOAD_ERROR_A;
- } else if (max_file_size && (total_bytes > max_file_size)) {
- #if DEBUG_FILE_UPLOAD
- sapi_module.sapi_error(E_NOTICE, "MAX_FILE_SIZE of %ld bytes exceeded - file [%s=%s] not saved", max_file_size, param, filename);
- #endif
- cancel_upload = UPLOAD_ERROR_B;
- } else if (blen > 0) {
- wlen = write(fd, buff, blen);
- if (wlen == -1) {
- /* write failed */
- #if DEBUG_FILE_UPLOAD
- sapi_module.sapi_error(E_NOTICE, "write() failed - %s", strerror(errno));
- #endif
- cancel_upload = UPLOAD_ERROR_F;
- } else if (wlen < blen) {
- #if DEBUG_FILE_UPLOAD
- sapi_module.sapi_error(E_NOTICE, "Only %d bytes were written, expected to write %d", wlen, blen);
- #endif
- cancel_upload = UPLOAD_ERROR_F;
- } else {
- total_bytes += wlen;
- }
- offset += wlen;
- }
- }
- if (fd!=-1) { /* may not be initialized if file could not be created */
- close(fd);
- }
- if (!cancel_upload && !end) {
- #if DEBUG_FILE_UPLOAD
- sapi_module.sapi_error(E_NOTICE, "Missing mime boundary at the end of the data for file %s", strlen(filename) > 0 ? filename : "");
- #endif
- cancel_upload = UPLOAD_ERROR_C;
- }
- #if DEBUG_FILE_UPLOAD
- if(strlen(filename) > 0 && total_bytes == 0 && !cancel_upload) {
- sapi_module.sapi_error(E_WARNING, "Uploaded file size 0 - file [%s=%s] not saved", param, filename);
- cancel_upload = 5;
- }
- #endif
- if (php_rfc1867_callback != NULL) {
- multipart_event_file_end event_file_end;
- event_file_end.post_bytes_processed = SG(read_post_bytes);
- event_file_end.temp_filename = temp_filename;
- event_file_end.cancel_upload = cancel_upload;
- if (php_rfc1867_callback(MULTIPART_EVENT_FILE_END, &event_file_end, &event_extra_data TSRMLS_CC) == FAILURE) {
- cancel_upload = UPLOAD_ERROR_X;
- }
- }
- if (cancel_upload) {
- if (temp_filename) {
- if (cancel_upload != UPLOAD_ERROR_E) { /* file creation failed */
- unlink(temp_filename);
- }
- efree(temp_filename);
- }
- temp_filename="";
- } else {
- zend_hash_add(SG(rfc1867_uploaded_files), temp_filename, strlen(temp_filename) + 1, &temp_filename, sizeof(char *), NULL);
- }
- /* is_arr_upload is true when name of file upload field
- * ends in [.*]
- * start_arr is set to point to 1st [
- */
- is_arr_upload = (start_arr = strchr(param,'[')) && (param[strlen(param)-1] == ']');
- if (is_arr_upload) {
- array_len = strlen(start_arr);
- if (array_index) {
- efree(array_index);
- }
- array_index = estrndup(start_arr+1, array_len-2);
- }
- /* Add $foo_name */
- if (llen < strlen(param) + MAX_SIZE_OF_INDEX + 1) {
- llen = strlen(param);
- lbuf = (char *) safe_erealloc(lbuf, llen, 1, MAX_SIZE_OF_INDEX + 1);
- llen += MAX_SIZE_OF_INDEX + 1;
- }
- if (is_arr_upload) {
- if (abuf) efree(abuf);
- abuf = estrndup(param, strlen(param)-array_len);
- snprintf(lbuf, llen, "%s_name[%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s_name", param);
- }
- #if HAVE_MBSTRING && !defined(COMPILE_DL_MBSTRING)
- if (php_mb_encoding_translation(TSRMLS_C)) {
- if (num_vars>=num_vars_max){
- php_mb_gpc_realloc_buffer(&val_list, &len_list, &num_vars_max,
- 1 TSRMLS_CC);
- }
- val_list[num_vars] = filename;
- len_list[num_vars] = strlen(filename);
- num_vars++;
- if(php_mb_gpc_encoding_detector(val_list, len_list, num_vars, NULL TSRMLS_CC) == SUCCESS) {
- str_len = strlen(filename);
- php_mb_gpc_encoding_converter(&filename, &str_len, 1, NULL, NULL TSRMLS_CC);
- }
- s = php_mb_strrchr(filename, '\' TSRMLS_CC);
- if ((tmp = php_mb_strrchr(filename, '/' TSRMLS_CC)) > s) {
- s = tmp;
- }
- num_vars--;
- goto filedone;
- }
- #endif
- /* The check should technically be needed for win32 systems only where
- * it is a valid path separator. However, IE in all it's wisdom always sends
- * the full path of the file on the user's filesystem, which means that unless
- * the user does basename() they get a bogus file name. Until IE's user base drops
- * to nill or problem is fixed this code must remain enabled for all systems.
- */
- s = strrchr(filename, '\');
- if ((tmp = strrchr(filename, '/')) > s) {
- s = tmp;
- }
- #ifdef PHP_WIN32
- if (PG(magic_quotes_gpc)) {
- s = s ? s : filename;
- tmp = strrchr(s, ''');
- s = tmp > s ? tmp : s;
- tmp = strrchr(s, '"');
- s = tmp > s ? tmp : s;
- }
- #endif
- #if HAVE_MBSTRING && !defined(COMPILE_DL_MBSTRING)
- filedone:
- #endif
- if (!is_anonymous) {
- if (s && s > filename) {
- safe_php_register_variable(lbuf, s+1, strlen(s+1), NULL, 0 TSRMLS_CC);
- } else {
- safe_php_register_variable(lbuf, filename, strlen(filename), NULL, 0 TSRMLS_CC);
- }
- }
- /* Add $foo[name] */
- if (is_arr_upload) {
- snprintf(lbuf, llen, "%s[name][%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s[name]", param);
- }
- if (s && s > filename) {
- register_http_post_files_variable(lbuf, s+1, http_post_files, 0 TSRMLS_CC);
- } else {
- register_http_post_files_variable(lbuf, filename, http_post_files, 0 TSRMLS_CC);
- }
- efree(filename);
- s = NULL;
- /* Possible Content-Type: */
- if (cancel_upload || !(cd = php_mime_get_hdr_value(header, "Content-Type"))) {
- cd = "";
- } else {
- /* fix for Opera 6.01 */
- s = strchr(cd, ';');
- if (s != NULL) {
- *s = '';
- }
- }
- /* Add $foo_type */
- if (is_arr_upload) {
- snprintf(lbuf, llen, "%s_type[%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s_type", param);
- }
- if (!is_anonymous) {
- safe_php_register_variable(lbuf, cd, strlen(cd), NULL, 0 TSRMLS_CC);
- }
- /* Add $foo[type] */
- if (is_arr_upload) {
- snprintf(lbuf, llen, "%s[type][%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s[type]", param);
- }
- register_http_post_files_variable(lbuf, cd, http_post_files, 0 TSRMLS_CC);
- /* Restore Content-Type Header */
- if (s != NULL) {
- *s = ';';
- }
- s = "";
- /* Initialize variables */
- add_protected_variable(param TSRMLS_CC);
- magic_quotes_gpc = PG(magic_quotes_gpc);
- PG(magic_quotes_gpc) = 0;
- /* if param is of form xxx[.*] this will cut it to xxx */
- if (!is_anonymous) {
- safe_php_register_variable(param, temp_filename, strlen(temp_filename), NULL, 1 TSRMLS_CC);
- }
- /* Add $foo[tmp_name] */
- if (is_arr_upload) {
- snprintf(lbuf, llen, "%s[tmp_name][%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s[tmp_name]", param);
- }
- add_protected_variable(lbuf TSRMLS_CC);
- register_http_post_files_variable(lbuf, temp_filename, http_post_files, 1 TSRMLS_CC);
- PG(magic_quotes_gpc) = magic_quotes_gpc;
- {
- zval file_size, error_type;
- error_type.value.lval = cancel_upload;
- error_type.type = IS_LONG;
- /* Add $foo[error] */
- if (cancel_upload) {
- file_size.value.lval = 0;
- file_size.type = IS_LONG;
- } else {
- file_size.value.lval = total_bytes;
- file_size.type = IS_LONG;
- }
- if (is_arr_upload) {
- snprintf(lbuf, llen, "%s[error][%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s[error]", param);
- }
- register_http_post_files_variable_ex(lbuf, &error_type, http_post_files, 0 TSRMLS_CC);
- /* Add $foo_size */
- if (is_arr_upload) {
- snprintf(lbuf, llen, "%s_size[%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s_size", param);
- }
- if (!is_anonymous) {
- safe_php_register_variable_ex(lbuf, &file_size, NULL, 0 TSRMLS_CC);
- }
- /* Add $foo[size] */
- if (is_arr_upload) {
- snprintf(lbuf, llen, "%s[size][%s]", abuf, array_index);
- } else {
- snprintf(lbuf, llen, "%s[size]", param);
- }
- register_http_post_files_variable_ex(lbuf, &file_size, http_post_files, 0 TSRMLS_CC);
- }
- efree(param);
- }
- }
- fileupload_done:
- if (php_rfc1867_callback != NULL) {
- multipart_event_end event_end;
- event_end.post_bytes_processed = SG(read_post_bytes);
- php_rfc1867_callback(MULTIPART_EVENT_END, &event_end, &event_extra_data TSRMLS_CC);
- }
- SAFE_RETURN;
- }
