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

Time	Narration
00:00	A multidimensional array is an array in which you can store other arrays.
00:06	It is very similar to an associative array.
00:09	However, the associates for this array are arrays themselves.
00:14	For a better understanding, let us start the program.
00:19	I will create a program that lets you see the position of a letter in the English alphabet.
00:26	For example, if I give the value 1, it should echo out "A" in position 1.
00:33	If I give the value two, it should say "B" in position 2.
00:38	And for three, it will say "C" is in position 3 and so on.
00:43	First, I will create my own array.
00:53	And just for easy viewing, I will bring this down.
00:58	You are quite welcome to do so yourself.
01:01	And inside, I will create my own array which I will call "ABC".
01:10	That will be the array.
01:15	Instead of putting a value here, as we did before, we have an array inside.
01:24	And inside this, will be the values. For example, Capital A, B, C and D
01:32	and these values will be separated by commas.
01:41	And then we type “123” and that is equal to an array.
01:46	Now we’re just going to have 1,2,3,4, and that’s it.
01:53	Down here, I’ll show you how to echo out specific data inside the array.
01:59	We’ll call our main array.
02:02	And we’ll call this array as well.
02:05	And then the position of what you want inside the array. So, it is an array inside an array.
02:13	So, I will just type echo and then $alpha which is our main array
02:19	and then inside square brackets, 'ABC'.
02:23	And next, inside square brackets, the position of the element, if you want to retrieve.
02:30	Now, for example, is going to echo "A".
02:35	Let us give that a run - and we got "A".
02:47	Changing this to ‘123’, will hopefully give us "1".
02:54	As you can see here.
02:57	So we've made our two basic arrays inside our main array and we’ve learnt to call it.
03:05	Now I’m going to create a new program to find out the position of a letter, in relation to its number.
03:13	I’m going to type up here postion = 0 since 0 is the beginning.
03:30	Now I will echo out " Letter something is in position something".
03:39	This is going to be quite simple.
03:42	We enter a position here, say 3; since "C" is in position 3 in the alphabet, we get "C".
03:53	So , to echo out our letter, if I am going to replace the first blank with $alpha
04:02	'ABC'
04:05	'$pos'
04:07	as 'pos' represents our position.
04:11	So then, the position will be - $alpha... '123'
04:19	and then the position ‘$pos’.
04:23	At the moment, position is equal to 0.
04:29	We type ’echo something’. So this is position zero.
04:36	Position zero inside the internal array 'ABC'. So in actual fact, we are saying that "A" is in position 0
04:47	which is this array 123 and that is position zero. So, actually we are saying letter "A" is in position one.
04:56	Let's run this. Okay. "A" is in position 1. Let’s change this to 1.
05:05	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.
05:21	So I will put ‘-1’ at the end and put 1 in brackets for better legibility.
05:28	So, position one minus one is in fact zero. So, writing 1 will give the same result as writing 0. Writing 2 will give us the same result as writing 1...letter "B" is in position 2.
05:43	If I put 1 then we get "A" is in position 1. So if I put zero here, there is no position -1; so we get “Letter is in position”. So we don’t have the letter or the position.
06:01	So, I’ve made that a bit more user-friendly. Thanks for watching!

Contributors and Content Editors

Gaurav, Minal, PoojaMoolya, Pratik kamble, Sandhya.np14