First 250 days of software dev - Part 12

Day 111

Day 112

Let's go through the metaphor of a house:

• Class
  A class is a blueprint for a house. Many houses can be built using this design.
• Object
  Every house built (instantiate) is an object, also known as an instance.
• Reference
  Every house has an address. If you want to tell someone where a house is, you give them a card with the address written on it. This card is a reference to that object.
• Dereferencing
  If you want to visit home, you look at the address written on the card. That's dereferencing.

<?php
class EvSinifi{
    public function construct(){}
    public function doSomething(){
        echo "hi there, i'm bora :)
 <br>";
    }
}
$evim = new EvSinifi();  //1
caller($evim);  //2
$evim->doSomething();  //4
 
function caller(EvSinifi $digerEvim){
    $digerEvim = new EvSinifi(); //3
}

1. "new EvSinifi()" says that, using the EvSinifi design, a reference to the house is returned. You can copy this reference to the variable $home. You ask a contractor to build a house. He builds it. He tells you the address of the house. You write it down.
2. You give this address to a method (caller).
3. Here we have the reference "HomeClass $digerHome". There is a pass-by-value here. $digerHome inside caller is a copy of the reference $home. you gave caller your own card with the address of the house. what does caller do with this card? He asks for a new house to be built and writes the address of the new house on the card you gave him. Note that the caller cannot now reach the first house (the one built in phase 1). But that house does not change or disappear just because another house is written on the address card he has.

To summarize:

1. Ask the contractor to build a house. Let him build it. He gives us an address. Save this address in the variable $home (write it on a card)
2. We call caller. Before doing this, we copy the address in $home to a new card that we give to caller. caller calls this card $otherhome.
3. caller asks the builder for a new house. He builds it, gives him the address of the new house. caller copies this address onto the card we give him.
4. We go back to the first stage. We look at the original, unchanged card. We go to the house on the card and we do something there.

A different perspective and a different example:

Let's take an example from Java:

**String s;

**String s = "asdf";

**String s = new String("asdf");

The above examples are actually based entirely on the relationship between object and class in Java. Now let's look at how it is in PHP: Looking at the PHP Manual as the main source, we can see that object and class have the same distinction as in Java. PHP Manual- OOP Reference

Day 113

$a = $b = deger; 

$a = &$b = deger;

I have to add: That site has given me the most horizon-expanding information of the day (of course you know about it, but that's what it did for me). Pointer Reference

Day 114

• I was assuming that I had sent the code required for account activation by email (an assumption that indicated "sent" as a return in the relevant function output), and I was continuing operations with that assumption. I wanted to try the mail() function. I tried it (by providing the necessary configurations in php.ini and a related file). But I encountered the mail SMTP server error many times and couldn't find a solution. The error is probably caused by the TLS-SSL port. But since I couldn't solve it, and also because more modern methods of sending mail are preferred, I stopped trying. I haven't tried any other method.
• The second problem of the day was how to get the client ip. Yes, I saw that I could get it using $_SERVER['REMOTE_ADDR']. which I think is the best way. But, How to get the client ip address in php reading that comment, I questioned a bit too much whether there is a security vulnerability.

Day 115

Day 116

Day 117

Day 118

Day 119

Today, most of the day was spent watching your code live, witnessing the code writing and understanding it. I also think I understand it. After work, the strict type issue in php was discussed. The following article came to my mind at that moment, but I couldn't express it fully: Why is processing a sorted array faster than processing an unsorted array

A Nietzsche quote to mark the meaning and importance of the day:

“Verily, I have often laughed at the weaklings, who think themselves good because they have crippled paws!”

Day 120

First of all, since I had experienced the problems caused by the lack of namespace many times before (the same class names overlapping and the program producing undesirable results), I had already looked at its use and knew why it was used. So there was no problem there. What I encountered for the first time today was the autoloader itself. I learned what autoloader is, how it works, and then I needed to understand how the directory structure of the files should be. There was no single truth about this on the internet. Everyone had different approaches to directory structure. There was no single formula, but there were some solutions that were generally preferred: My main source for this was this article: On structuring php projects.