Use CodeIgniter's class library to do picture uploading _php tutorials

CodeIgniter file Upload class allows files to be uploaded. You can set a file that specifies to upload a file of a certain type and a specified size.

Common process for uploading files:

• A form for uploading files that allows the user to select a file and upload it.
• When this form is submitted, the file is uploaded to the specified directory.
• At the same time, the file will be verified to meet the requirements you set.
• Once the file is uploaded successfully, return a confirmation window with the successful upload.

Here is the form:

Then the following is the upload class:

Public Function Img_upload () {$this->load->helper (' url '); $config [' upload_path '] = './images/'. Date (' Ym ', Time ( )).' /'; $config [' allowed_types '] = ' gif|jpg|png '; $config [' file_name '] = date (' Y_m_d ', Time ()). ' _ '. sprintf ('%02d ', rand (0,99)); $config [' max_size '] = ' $ '; $config [' max_width ']  = ' 1024x768 '; $config [' Max_height ']  = ' 768 '; $this->load->library (' upload ', $config); if (! $this->upload->do_upload ())  {   $error = array (' error ' = = $this->upload->display_errors ());  } else  {   $data = array (' upload_data ' = = $this->upload->data ())}  }

Preferences setting parameters

Preference Settings	Default Value	Options	Description
Upload_path	None	None	File upload path. The path must be writable, and both the relative and absolute paths can be.
Allowed_types	None	None	The MIME type of the file that is allowed to be uploaded, usually the file extension can be MIME type. Allow multiple types with a vertical bar ' | ' Separate
file_name	None	The file name you want to use	If this parameter is set, CodeIgniter will rename the uploaded file according to the file name set here. The extension in the file name must also be the allowed file type.
Overwrite	FALSE	True/false (Boolean)	is overwritten. When this parameter is true, the original file will be overwritten if the file is uploaded with the same name, and if the parameter is False,ci, a number will be appended to the filename of the new file. If set to True, if a file with the same name as the one is uploading exists, it'll be overwritten. If set to False, a number would be appended to the filename if another with the same name exists.
Max_size	0	None	The maximum number of file sizes allowed to upload (in K). This parameter is 0 without restriction. Note: PHP usually has this limitation, which can be specified in the php.ini file. Typically, the default is 2MB.
Max_width	0	None	The maximum width (in pixels) for the uploaded file. 0 is not limited.
Max_height	0	None	The maximum height (in pixels) of the uploaded file. 0 is not limited.
Max_filename	0	None	The maximum length of the file name. 0 is not limited.
Encrypt_name	FALSE	True/false (Boolean)	Whether to rename the file. If this argument is true, the uploaded file will be renamed to a random encrypted string. This is useful when you want to make it impossible for a file uploader to differentiate the file names of the files that they upload. This option only works when overwrite is FALSE.
Remove_spaces	TRUE	True/false (Boolean)	When the argument is true, the space in the file name is replaced with an underscore. Recommended use.

A few of the functions used

• $this->upload->do_upload (): Perform the action based on your preference configuration parameters. Note: Files uploaded by default come from a file field named UserFile in the submission form, and the form must be of type "multipart".
• $this->upload->display_errors (): If do_upload () returns failure, an error message is displayed. This function does not automatically output, but returns data, so you can arrange it as you want.
• $this->upload->data (): This is an auxiliary function that returns an array of all relevant information about the file you uploaded.

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