Codeigniter renaming image file is not working - php

Question

I am using codeigniter and I'm trying to upload image files.
Everything is working fine, but I am unable to change the uploaded file name to a custom name.
I've tried everything for the past 5 hours, nothing is working.
If anyone can help, it would be great.
I just need to rename the uploaded file to custom_name.jpg
Controller file
public function uploadimage() {
$config['overwrite'] = TRUE;
$config['file_name'] = 'custom_name.jpg';
$config["allowed_types"] = 'jpg|jpeg|png|gif';
$config['upload_path'] = './uploads/';
$config["max_size"] = 1024;
$config["max_width"] = 400;
$config["max_height"] = 400;
$this->load->library('upload', $config);
if(!$this->upload->do_upload()) {
$this->data['error'] = $this->upload->display_errors();
} else {
echo "success";
}
}
VIEW file
<?php echo form_open_multipart('admin/uploadimage'); ?>
<?php echo form_upload('userfile'); ?><br />
<?php echo form_submit('upload', 'Upload');?>
<?php echo form_close(); ?>

Answer 1

just remove custom extension from file_name and append extension of file uploaded.
public function uploadimage() {
$config['overwrite'] = TRUE;
$config['file_name'] = 'custom_name';
$config["allowed_types"] = 'jpg|jpeg|png|gif';
$config['upload_path'] = './uploads/';
$config["max_size"] = 1024;
$config["max_width"] = 400;
$config["max_height"] = 400;
$this->load->library('upload', $config);
if(!$this->upload->do_upload()) {
$this->data['error'] = $this->upload->display_errors();
} else {
echo "success";
}
}
You can also use rename function to rename file after successful upload.
Also check these.
Upload directory is writable and the path can be absolute or relative.
Set preferences by calling the initialize() method, if you auto-load the class $this->upload->initialize($config)
You have some restriction on file size, also check your image size.