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For language learners, "The best way to learn a foreign language is to speak it" (via antimoon.com), which must be the most frequently repeat pieces. This approach for learning new staff is also useful for learning MySQL, with a little bit modify, "The best way to learn MySQL is to use it", which is the fast way to familiar with it.

Yesterday afternoon, when I worked on the assignment 2 of Internet Programming with CodeIgniter. The problem below always occurred am I'm struggling with solving this weird problem.

    A PHP Error was encountered
    Severity: Notice
    Message: Undefined index: Subject
    Filename: libraries/Email.php
    Line Number: 930 

At first, I thought the reason of this error occurred is related to the codeigniter email function within my confirmation controller. After I review my code several time, I still cannot get a clue for what's the issue there.

if ($this->protocol == 'mail')
{
    $this->_subject = $this->_headers['Subject'];
    unset($this->_headers['Subject']);
} 

I guess the problem is the programme flow is trying to ccess the 'Subject' index and which has unset in earlier time. I found a solution post "Bug with Email Class: Undefined Subject, although it's sent!!!" to confirm my guess. The code should be like this below an it does work. <

if ($this->protocol == 'mail')
{
    if (array_key_exists('Subject', $this->_headers))
    {
        $this->_subject = $this->_headers['Subject'];
        unset($this->_headers['Subject']);
    }
}