PHP-and-MySQL/C2/Multi-Dimensional-Arrays/English

Time	Narration
0:00	A multdimensional array is an array inside which you can store other arrays.
0:06- 0:08	It is very similar to the associative array.
0:09- 0:14	However, the associates for this array are arrays themselves.
0:15- 0:18	For a better understanding, let us start the program.
0:19- 0:24	I will create a program that lets you see the position of a letter in the English alphabet.
0:26- 0:32	For example, if I give the value 1, it should echo out "A" in position 1.
0:33- 0:37	If I give the value two it would say "B" in position 2.
0:38- 0:42	And for three, it will say "C" is in position 3, and so on.
0:43- 1:45	First I will create my own array.
0:53- 0:57	And just for easy viewing, I will bring this down.
0:58- 1:00	You are welcome going to do so yourself.
1:01- 1:06	And inside. I will create my own array, which I will call ‘ABC’.
1:10- 1:11	That will be the array.
1:15- 1:20	Instead of putting a value here, as we did before, we have an array inside.
1:24- 1:31	And inside these, will be the values, for example, Capital A, B, C and D.
1:32- 1:35	These values are separated by commas.
1:51- 1:56	And then we type “123” and that is equal to an array.
1:45- 1:50	Now we’re just going to have ‘1,2,3,4, and that’s it.
1:53- 1:58	Down here, I’ll show you how to echo out specific data inside the array.
1:59-2:01	We’ll call our main array.
2:03- 2:04	And we’ll call this array as well.
2:05- 2:12	And then the position of what you want inside the array. So it’s an array inside an array.
2:13-2:18	So I will type ‘echo’ and then ‘alpha’ which is our main array.
2:19- 2:22	And then inside square brackets, ‘ABC’.
2:23- 2:29	And next, inside square brackets, the position of the element you want to retrieve.
2:28- 2:34	Now, for example, is going to echo "A".
2:35- 2:44	Let us give that a run - and we got "A".
2:47- 2:51	Changing this to ‘123’, will hopefully give us "1".
2:54- 2:56	As you can see here.
2:57-3:04	So we've made our two basic arrays inside our main arrays, and we’ve learnt to call it.
3:05- 3:11	Now I’m going to create a new program to find out the position of a letter in relation to its number.
3:13- - 3:26	I’m going to type up here ‘ postion = 0’, since 0 is the beginning.
3:30- 3:35	Now I will echo out ‘Letter something is in position something’.
3:39- 3:40	This is quite simple.
3:42- 3:51	We enter a position here, say 3. Since C is in position 3 in the alphabet, we get C.
3:53- 3:59	So , to echo out our letter, if I am going to replace the first blank with ‘alpha’.
4:02- 4:03	ABC
4:05- 4:06	'pos'
4:07- 4:09	as 'pos' represents our position.
4:11- 4:17	So then, the position will be - Alpha... 123
4:19- 4:22	And then the position, ‘pos’.
4:23- 4:26	At the moment, position is equal to 0.
4:29- 4:35	We type ’echo something’. So this is position zero.
4:36- 4:46--??	Position zero inside the internal array “ABC”. So in actual fact, we are saying that A is in position 0,
4:47- 4:55	which is this array, 123 and that is position zero. So actually we are saying that letter A is in position one.
4:55- 5:04	Lets run this. Okay. A is in position 1. Let’s change this to 1.
5:05- 5:17	Refresh. Letter B is in position 2. Now what I will do to make this application fully functional and easy to navigate, is eliminate the necessity to write zero for 1.
5:21- 5:29	So I will put ‘-1’ at the end and put 1 in brackets for better legibility.
5:30- 5:44	So, position one minus one is infact zero. So, writing 1 will give the same result as 0. Writing 2 will give us the same result as writing 1... So letter B is in position 2.
5:44- 6:01	So if I put 1 we get A is in position 1. If I put zero here; there is no position -1; so we get “letter in position”. So we don’t have the letter or the position.
6:02 onwards	So, I’ve made that a bit more user-friendly. Thanks for watching!

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Chandrika