Can someone explain to me the step by step on how for loop works

Answer 1

for (int A = 0; A < 10; A++) {
//code
}

When the first iteration of the loop starts, the code in the first section runs. In this case, it creates a variable A and gives it the value, 0.
Next, if the condition in the second section is true, the code runs. You can use A in here.
Now, it tests the condition again, just like in a while loop, and if it is true, it runs the code in the third section and then runs the loop again. A still exists at this point.

Once the loop finally ends because the condition is false, A gets deleted.

Now, that is how it works, but why not just use a while loop?
A for loop is specifically designed for counting a certain number of iterations. The main benefit is being able to declare a variable that will stay for every iteration but get deleted afterwards. It is also useful because it forces you to remember to increment the variable you are using to count.

Answer 2

<?php

// We have 7 indices start from 0 in the $weekdays array.

$weekdays = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'];

// loop through those indices by incrementing by 1, until we get 6.
// Now pass the $i as index in weekdays array.

for ($i=0; $i <= 6; $i++) {

echo $weekdays[$i]."<br>";

// Outputs:
// Monday
// Tuesday
// Wednesday
// Thursday
// Friday
// Saturday
// Sunday

// to get the same result without looping.
// we would do it like:
/*

echo $weekdays[0]."<br>";
echo $weekdays[1]."<br>";
echo $weekdays[2]."<br>";
echo $weekdays[3]."<br>";
echo $weekdays[4]."<br>";
echo $weekdays[5]."<br>";
echo $weekdays[6]."<br>";
*/

/* So now you can see how looping can be useful.
// foreach can achieve the same too: foreach ($variable as $key => $value) {
# code...
}
*/

}

// I hope it helps