Difference between revisions of "PHP-and-MySQL/C2/Variables-in-PHP/English-timed"
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| − | |Welcome to a basic tutorial on PHP variables. | + | |Welcome to a basic tutorial on '''PHP variables'''. |
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| − | |PHP variables are very easy to use; I'm sure you'll understand them straight away. | + | |'''PHP variables''' are very easy to use; I'm sure you'll understand them straight away. |
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| − | |You don't need to declare them and they're quite easy to write. | + | |You don't need to '''declare''' them and they're quite easy to write. |
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| − | |So there's no need to declare them in a different way each time | + | |So, there's no need to declare them in a different way each time or create a value for them each time. |
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|00:36 | |00:36 | ||
| − | |So, for example, let's create our PHP tags here and our content goes in between. | + | |So, for example, let's create our '''PHP tags''' here and our content goes in between. |
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|00:41 | |00:41 | ||
| − | |Okay. Now we start with the dollar sign and then we have our variable name. | + | |Okay. Now we start with the dollar sign ($) and then we have our variable name. |
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| − | |What I can start with is an "underscore" or a "letter". | + | |What I can start with is: an "underscore" or a "letter". |
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| − | |No other special characters are allowed except underscores, letters and numbers | + | |No other special characters are allowed except underscores, letters and numbers as long as it doesn't start with a number. |
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| − | |So that would be perfectly acceptable here. | + | |So, that would be perfectly acceptable here. |
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| − | |Okay, | + | |Okay. So, I'll create a variable called '''name''' and that's going to be equal to a string value contained within double quotes, just like we used for the "echo" function. |
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| − | | | + | |"My name is Alex". |
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| − | |On the next line, we're going to create another variable using a dollar sign | + | |On the next line, we're going to create another variable using a dollar sign ($) called '''age'''. That's going to be equal to '19', without double quotes. |
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| − | |You can use it for decimal values as well. | + | |You can use it for decimal values as well. So, this could be '19.5' or nineteen and a half. |
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| − | |However, at the moment it's just an integer. That's how I want it - the variable 'name' is a string and the variable 'age' is an integer. | + | |However, at the moment it's just an integer. That's how I want it - the variable 'name' is a '''string''' and the variable 'age' is an '''integer'''. |
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| − | |Okay | + | |Okay. So, the thing with variables is that they are very easy to concatenate into a string. |
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| − | |If you don't know what concatenation is, it just means to join two things together or to join two strings together in a line. | + | |If you don't know what concatenation is, it just means to join two things together or to join two '''strings''' together in a line. |
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| − | |But there is a completely different tutorial on that. So, what I'll say is, for now, you don't need to include this as one of your variables when you're echoing | + | |But there is a completely different tutorial on that. So, what I'll say is, for now, you don't need to include this as one of your variables when you're echoing this out. |
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| − | |I'll say "My name is" name "and my age is" and put my age down. | + | |I'll say "My name is" '''$name''' "and my age is" and put my age down. |
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|03:24 | |03:24 | ||
| − | |Now, it's all in one string, all in one echo | + | |Now, it's all in one string, all in one echo and we've just got 'My name is' – plain text. |
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| − | |So, we can refresh that and you can see that "My name is Alex" | + | |So, we can '''refresh''' that and you can see that "My name is Alex", that's our variable "and my age is 19" and that's our variable. |
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|03:48 | |03:48 | ||
| − | |So they're really easy to put into strings. | + | |So, they're really easy to put into strings. |
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Revision as of 17:36, 18 May 2015
| Time | Narration |
| 00:00 | Welcome to a basic tutorial on PHP variables. |
| 00:04 | Let me quickly go through a few things first. |
| 00:07 | PHP variables are very easy to use; I'm sure you'll understand them straight away. |
| 00:14 | You don't need to declare them and they're quite easy to write. |
| 00:18 | You can add a value to a variable half way through the script. |
| 00:23 | Also, they automatically convert to the data type you require. |
| 00:28 | So, there's no need to declare them in a different way each time or create a value for them each time. |
| 00:36 | So, for example, let's create our PHP tags here and our content goes in between. |
| 00:41 | Okay. Now we start with the dollar sign ($) and then we have our variable name. |
| 00:48 | Please note that you can't start with a "number". So I can't start with a '1'. |
| 00:53 | What I can start with is: an "underscore" or a "letter". |
| 00:57 | No other special characters are allowed except underscores, letters and numbers as long as it doesn't start with a number. |
| 01:06 | So, that would be perfectly acceptable here. |
| 01:09 | Okay. So, I'll create a variable called name and that's going to be equal to a string value contained within double quotes, just like we used for the "echo" function. |
| 01:21 | "My name is Alex". |
| 01:23 | On the next line, we're going to create another variable using a dollar sign ($) called age. That's going to be equal to '19', without double quotes. |
| 01:33 | Now the reason for this is that this is an integer. |
| 01:36 | You can use it for decimal values as well. So, this could be '19.5' or nineteen and a half. |
| 01:43 | That would also automatically convert this into a decimal. |
| 01:48 | However, at the moment it's just an integer. That's how I want it - the variable 'name' is a string and the variable 'age' is an integer. |
| 01:57 | So, let's try echoing these out. |
| 02:00 | What we need is "echo" and the variable name, not forgetting your line terminator. |
| 02:06 | Okay, let's find our file named "variables". |
| 02:11 | Okay, "Alex" has been echoed out, just like I've said here, "echo name". |
| 02:16 | Let's try and echo out my age now. |
| 02:19 | It's just an integer variable and that's been echoed out here. |
| 02:24 | Okay. So, the thing with variables is that they are very easy to concatenate into a string. |
| 02:30 | In fact, probably, concatenation is the wrong word – they're very easy to include inside your string. |
| 02:37 | If you don't know what concatenation is, it just means to join two things together or to join two strings together in a line. |
| 02:46 | So, an example of concatenation would be, let's see, 'concat' and then I could say, '.' and then 'ination'. |
| 02:56 | Now, this would echo out 'concatination'. |
| 02:59 | Let's try this. Okay? |
| 03:03 | But there is a completely different tutorial on that. So, what I'll say is, for now, you don't need to include this as one of your variables when you're echoing this out. |
| 03:14 | If you can't follow this, don't worry. This is very very simple. |
| 03:18 | I'll say "My name is" $name "and my age is" and put my age down. |
| 03:24 | Now, it's all in one string, all in one echo and we've just got 'My name is' – plain text. |
| 03:32 | Variable is called. This is put here. And then when age is called, the value for age is put here. |
| 03:40 | So, we can refresh that and you can see that "My name is Alex", that's our variable "and my age is 19" and that's our variable. |
| 03:48 | So, they're really easy to put into strings. |
| 03:52 | Okay, this is all you really need to know about variables. |
| 03:56 | There are other types of variables, like boolean, decimal – which I've shown you, for example like '19.5'. |
| 04:06 | You would declare them in the same way, with a dollar sign. |
| 04:10 | So practice this and you can come back and learn some more advanced functionality later on, when I'm going through some other projects. |
| 04:19 | Thanks for watching! This is Joshua Mathew dubbing for the Spoken Tutorial project. (Script contributed by Bhavini Pant). |
