Codeigniter: Override variable in auto-loaded config file -

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i have following:

config/email.php

$config['protocol']  = 'smtp'; $config['smtp_host'] = "xxxxxx"; $config['smtp_user'] = "xxxxxx"; $config['smtp_pass'] = "xxxxxx"; $config['smtp_port'] = xx;    $config['wordwrap'] = true; $config['mailtype'] = 'html';  $config['charset']  = 'utf-8'; $config['newline'] = "\r\n";


in cases, i'm sending html plain-text alternative emails. config works perfectly.

now in 1 special case, i'm wanting send plain-text email need override setting to:$config['mailtype'] = 'text';

how can that? tried specifying new config array , loading library again still sends html:

 $email_config = array(         'mailtype'  => 'text'  );   $this->load->library('email', $email_config);

i think need call initialize when don't load config file.

$this->email->initialize($email_config);

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