Difference between revisions of "PHP-and-MySQL/C2/If-Statement/English-timed"
From Script | Spoken-Tutorial
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|Welcome to this basic php Spoken Tutorial. Here we will discuss the 'IF' statement. | |Welcome to this basic php Spoken Tutorial. Here we will discuss the 'IF' statement. | ||
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| − | | | + | |00:06 |
|If you have written code before, you would have come across the 'IF' statement | |If you have written code before, you would have come across the 'IF' statement | ||
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| − | | | + | |00:11 |
|Its not much different in php. I'll execute one shortly and show you | |Its not much different in php. I'll execute one shortly and show you | ||
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| − | | | + | |00:16 |
|So, let us start. | |So, let us start. | ||
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| − | | | + | |00:18 |
|Okay, here is a brief about the 'IF' statement. It takes a condition. | |Okay, here is a brief about the 'IF' statement. It takes a condition. | ||
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| − | | | + | |00:23 |
|If the condition is True, it executes one path of code. | |If the condition is True, it executes one path of code. | ||
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| − | | | + | |00:28 |
|If it is False, it will execute another path of code. | |If it is False, it will execute another path of code. | ||
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| − | | | + | |00:32 |
|For example - this is the structure. | |For example - this is the structure. | ||
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| − | | | + | |00:36 |
|If - inside the bracket is the condition to know whether 1 equals 1. | |If - inside the bracket is the condition to know whether 1 equals 1. | ||
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| − | | | + | |00:41 |
|Notice I am using a double equal to sign here. This is the comparison operator. | |Notice I am using a double equal to sign here. This is the comparison operator. | ||
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| − | | | + | |00:47 |
|In another tutorial we're going to learn about operators. | |In another tutorial we're going to learn about operators. | ||
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| − | | | + | |00:50 |
|It reads as 'is equal to' though it is not the same as 'equals' | |It reads as 'is equal to' though it is not the same as 'equals' | ||
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| − | | | + | |00:56 |
|When we're using variables, when we want to compare, we use double equal to. | |When we're using variables, when we want to compare, we use double equal to. | ||
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| − | | | + | |01:02 |
|If you are going for the True path, you can use two curly brackets. | |If you are going for the True path, you can use two curly brackets. | ||
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| − | | | + | |01:06 |
|We're going to open one here. | |We're going to open one here. | ||
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| − | | | + | |01:08 |
|Our code will go in between the brackets. | |Our code will go in between the brackets. | ||
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| − | | | + | |01:12 |
|If its Not True, we'll say else. | |If its Not True, we'll say else. | ||
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| − | | | + | |01:15 |
|The same structure - so two curly brackets. | |The same structure - so two curly brackets. | ||
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| − | | | + | |01:17 |
|For example, if 1 equals 1 we say echo True. | |For example, if 1 equals 1 we say echo True. | ||
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| − | | | + | |01:23 |
|If 1 is not equal 1, what we should get when we run our file is False. | |If 1 is not equal 1, what we should get when we run our file is False. | ||
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| − | | | + | |01:30 |
|Since 1 is equal to 1 what we get when we run our file is True | |Since 1 is equal to 1 what we get when we run our file is True | ||
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| − | | | + | |01:36 |
|Let us change this, if 1 equals 2, which it doesn't, then we'll get False. | |Let us change this, if 1 equals 2, which it doesn't, then we'll get False. | ||
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| − | | | + | |01:42 |
|So we would have already created a simple program to tell us if one number equals another. | |So we would have already created a simple program to tell us if one number equals another. | ||
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| − | | | + | |01:49 |
|This is quite a silly application for a program. | |This is quite a silly application for a program. | ||
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| − | | | + | |01:52 |
|So I will just add something more. I'll create a little program for a password access. | |So I will just add something more. I'll create a little program for a password access. | ||
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| − | | | + | |01:58 |
|We are going to store the password in a variable here. | |We are going to store the password in a variable here. | ||
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| − | | | + | |02:03 |
|Say the password is abc. | |Say the password is abc. | ||
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| − | | | + | |02:05 |
|I am going to incorporate a variable into my IF function by saying | |I am going to incorporate a variable into my IF function by saying | ||
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| − | | | + | |02:11 |
|If password, remember double equals 'def' | |If password, remember double equals 'def' | ||
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| − | | | + | |02:15 |
|And I'll say 'Access granted' | |And I'll say 'Access granted' | ||
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| − | | | + | |02:21 |
|Sorry, I made a mistake. 'def' is the password we want to ask the user for. 'abc' is the password I'm inputting to the system. | |Sorry, I made a mistake. 'def' is the password we want to ask the user for. 'abc' is the password I'm inputting to the system. | ||
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| − | | | + | |02:32 |
|So if it doesn't equal 'def', I'll say 'Access denied'. | |So if it doesn't equal 'def', I'll say 'Access denied'. | ||
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| − | | | + | |02:39 |
|The password that I've inputted is 'abc'. | |The password that I've inputted is 'abc'. | ||
|- | |- | ||
| − | | | + | |02:42 |
|We're going to compare the password to 'def', which is the stored password. | |We're going to compare the password to 'def', which is the stored password. | ||
|- | |- | ||
| − | | | + | |02:50 |
|If this equals 'def', we're going to say 'Access granted' else 'Access denied'. | |If this equals 'def', we're going to say 'Access granted' else 'Access denied'. | ||
|- | |- | ||
| − | | | + | |02:57 |
|Lets try this. | |Lets try this. | ||
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| − | | | + | |03:00 |
|'Access denied'. This is because the passwords do not match. | |'Access denied'. This is because the passwords do not match. | ||
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| − | | | + | |03:05 |
|On this basis, you can see here that I've incorporated a variable. | |On this basis, you can see here that I've incorporated a variable. | ||
|- | |- | ||
| − | | | + | |03:10 |
|Change this to 'def' and we'll get 'Access granted'. | |Change this to 'def' and we'll get 'Access granted'. | ||
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| − | | | + | |03:18 |
|Because I have one line of code here and another one line of code here. | |Because I have one line of code here and another one line of code here. | ||
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| − | | | + | |03:22 |
|I can get rid of these curly brackets. | |I can get rid of these curly brackets. | ||
|- | |- | ||
| − | | | + | |03:25 |
|To me that looks a lot neater. | |To me that looks a lot neater. | ||
|- | |- | ||
| − | | | + | |03:29 |
|Please note - there is no point in adding curly brackets if you have only one line of code for simple IF statements like these. | |Please note - there is no point in adding curly brackets if you have only one line of code for simple IF statements like these. | ||
|- | |- | ||
| − | | | + | |03:37 |
|If you're going to have a line after line here, you'll need the curly brackets. | |If you're going to have a line after line here, you'll need the curly brackets. | ||
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| − | | | + | |03:42 |
|For example, lets set a new variable here. | |For example, lets set a new variable here. | ||
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| − | | | + | |03:46 |
|Access equals 'Allowed' | |Access equals 'Allowed' | ||
|- | |- | ||
| − | | | + | |03:52 |
|That's just basically another line of code. | |That's just basically another line of code. | ||
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| − | | | + | |03:57 |
|But when I try and run this, we get an error. | |But when I try and run this, we get an error. | ||
|- | |- | ||
| − | | | + | |04:02 |
|It says an unexpected T_else on line 8 | |It says an unexpected T_else on line 8 | ||
|- | |- | ||
| − | | | + | |04:08 |
|Lets find line 8. Its here. The line before it is causing a problem. | |Lets find line 8. Its here. The line before it is causing a problem. | ||
|- | |- | ||
| − | | | + | |04:13 |
|Which is why we need to add our curly brackets back in to cater for two or more lines of code. | |Which is why we need to add our curly brackets back in to cater for two or more lines of code. | ||
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| − | | | + | |04:22 |
|We refresh this and Access is granted. | |We refresh this and Access is granted. | ||
|- | |- | ||
| − | | | + | |04:25 |
|Now I've set a new variable, access to be allowed. | |Now I've set a new variable, access to be allowed. | ||
|- | |- | ||
| − | | | + | |04:29 |
|This won't be of much help. | |This won't be of much help. | ||
|- | |- | ||
| − | | | + | |04:32 |
|But I was just giving you an example. | |But I was just giving you an example. | ||
|- | |- | ||
| − | | | + | |04:35 |
|You can see this is still a single line and these are double lines and you can't mix them up. | |You can see this is still a single line and these are double lines and you can't mix them up. | ||
|- | |- | ||
| − | | | + | |04:40 |
|OK, so I've created a variable. I've incorporated it into an IF statement. Hope this was useful. | |OK, so I've created a variable. I've incorporated it into an IF statement. Hope this was useful. | ||
|- | |- | ||
| − | | | + | |04:46 |
|This brings us to end of this tutorial. | |This brings us to end of this tutorial. | ||
|- | |- | ||
| − | | | + | |04:50 |
|This is Madhu dubbing for the Spoken Tutorial Project. Thanks for watching. Bye. | |This is Madhu dubbing for the Spoken Tutorial Project. Thanks for watching. Bye. | ||
Revision as of 11:02, 10 July 2014
| Time | Narration |
|---|---|
| 00:0 | Welcome to this basic php Spoken Tutorial. Here we will discuss the 'IF' statement. |
| 00:06 | If you have written code before, you would have come across the 'IF' statement |
| 00:11 | Its not much different in php. I'll execute one shortly and show you |
| 00:16 | So, let us start. |
| 00:18 | Okay, here is a brief about the 'IF' statement. It takes a condition. |
| 00:23 | If the condition is True, it executes one path of code. |
| 00:28 | If it is False, it will execute another path of code. |
| 00:32 | For example - this is the structure. |
| 00:36 | If - inside the bracket is the condition to know whether 1 equals 1. |
| 00:41 | Notice I am using a double equal to sign here. This is the comparison operator. |
| 00:47 | In another tutorial we're going to learn about operators. |
| 00:50 | It reads as 'is equal to' though it is not the same as 'equals' |
| 00:56 | When we're using variables, when we want to compare, we use double equal to. |
| 01:02 | If you are going for the True path, you can use two curly brackets. |
| 01:06 | We're going to open one here. |
| 01:08 | Our code will go in between the brackets. |
| 01:12 | If its Not True, we'll say else. |
| 01:15 | The same structure - so two curly brackets. |
| 01:17 | For example, if 1 equals 1 we say echo True. |
| 01:23 | If 1 is not equal 1, what we should get when we run our file is False. |
| 01:30 | Since 1 is equal to 1 what we get when we run our file is True |
| 01:36 | Let us change this, if 1 equals 2, which it doesn't, then we'll get False. |
| 01:42 | So we would have already created a simple program to tell us if one number equals another. |
| 01:49 | This is quite a silly application for a program. |
| 01:52 | So I will just add something more. I'll create a little program for a password access. |
| 01:58 | We are going to store the password in a variable here. |
| 02:03 | Say the password is abc. |
| 02:05 | I am going to incorporate a variable into my IF function by saying |
| 02:11 | If password, remember double equals 'def' |
| 02:15 | And I'll say 'Access granted' |
| 02:21 | Sorry, I made a mistake. 'def' is the password we want to ask the user for. 'abc' is the password I'm inputting to the system. |
| 02:32 | So if it doesn't equal 'def', I'll say 'Access denied'. |
| 02:39 | The password that I've inputted is 'abc'. |
| 02:42 | We're going to compare the password to 'def', which is the stored password. |
| 02:50 | If this equals 'def', we're going to say 'Access granted' else 'Access denied'. |
| 02:57 | Lets try this. |
| 03:00 | 'Access denied'. This is because the passwords do not match. |
| 03:05 | On this basis, you can see here that I've incorporated a variable. |
| 03:10 | Change this to 'def' and we'll get 'Access granted'. |
| 03:18 | Because I have one line of code here and another one line of code here. |
| 03:22 | I can get rid of these curly brackets. |
| 03:25 | To me that looks a lot neater. |
| 03:29 | Please note - there is no point in adding curly brackets if you have only one line of code for simple IF statements like these. |
| 03:37 | If you're going to have a line after line here, you'll need the curly brackets. |
| 03:42 | For example, lets set a new variable here. |
| 03:46 | Access equals 'Allowed' |
| 03:52 | That's just basically another line of code. |
| 03:57 | But when I try and run this, we get an error. |
| 04:02 | It says an unexpected T_else on line 8 |
| 04:08 | Lets find line 8. Its here. The line before it is causing a problem. |
| 04:13 | Which is why we need to add our curly brackets back in to cater for two or more lines of code. |
| 04:22 | We refresh this and Access is granted. |
| 04:25 | Now I've set a new variable, access to be allowed. |
| 04:29 | This won't be of much help. |
| 04:32 | But I was just giving you an example. |
| 04:35 | You can see this is still a single line and these are double lines and you can't mix them up. |
| 04:40 | OK, so I've created a variable. I've incorporated it into an IF statement. Hope this was useful. |
| 04:46 | This brings us to end of this tutorial. |
| 04:50 | This is Madhu dubbing for the Spoken Tutorial Project. Thanks for watching. Bye. |
