Solution to the problem that codeigniter uploaded pictures can't correctly identify picture types

When uploading pictures with the upload class of codeigniter, it is obviously an jpg format picture, but ci is always identified as application/octet-stream type, which leads to upload failure. The following data are collected, and the solutions are as follows:

Open the fileinfo extension in php. ini to get the correct type:

//windows

extension = php_fileinfo.dll
//linux

extension = fileinfo.so

Note: About fileinfo

PHP officially recommends that the replacement function for mime_content_type () is the Fileinfo function. PHP 5.3. 0 + already supports the Fileinfo function by default (fileinfo support-enabled), so you can use finfo_open () to determine the MIME type of the fetch file without any configuration. Centos default installation of LAMP environment php version php is still PHP 5.2. 6, below 5.3. 0 version may appear similar error prompt: PHP Fatal error: Call ES40undefined function finfo_open () in …. Because of the previous version of php, the magic_open class needs to be loaded, and the fileinfo function belongs to the PECL extension, so the fileinfo PECL extension can be enabled