PHP-and-MySQL/C2/Multi-Dimensional-Arrays/English-timed
From Script | Spoken-Tutorial
| 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! |
