Difference between revisions of "PHP-and-MySQL/C4/PHP-String-Functions-Part-2/English-timed"
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| − | + | |'''Time''' | |
| − | + | |'''Narration''' | |
|- | |- | ||
| − | | | + | |00:00 |
|Ok back to the second part of the String Functions tutorial. | |Ok back to the second part of the String Functions tutorial. | ||
|- | |- | ||
| − | | | + | |00:03 |
|I'm going to go through the rest of the functions starting from String Reverse. | |I'm going to go through the rest of the functions starting from String Reverse. | ||
|- | |- | ||
| − | | | + | |00:08 |
|String reverse probably to make sense is s-t-r-rev. | |String reverse probably to make sense is s-t-r-rev. | ||
|- | |- | ||
| − | | | + | |00:11 |
|So what strvev does is it reverses the contents of a string. | |So what strvev does is it reverses the contents of a string. | ||
|- | |- | ||
| − | | | + | |00:20 |
|So if I were to say 'Hello' and I were to reverse that, it would be "o-l-l-e-H". | |So if I were to say 'Hello' and I were to reverse that, it would be "o-l-l-e-H". | ||
|- | |- | ||
| − | | | + | |00:30 |
|And it can be useful in some circumstances although you usually wouldn't use this. | |And it can be useful in some circumstances although you usually wouldn't use this. | ||
|- | |- | ||
| − | | | + | |00:36 |
|But you could use this function if you want to specifically reverse a string. | |But you could use this function if you want to specifically reverse a string. | ||
|- | |- | ||
| − | | | + | |00:41 |
|I think its a useful and fun function to use. | |I think its a useful and fun function to use. | ||
|- | |- | ||
| − | | | + | |00:45 |
|Ok - the next set of functions I have grouped together are these: str to lower and str to upper. | |Ok - the next set of functions I have grouped together are these: str to lower and str to upper. | ||
|- | |- | ||
| − | | | + | |00:54 |
|This basically means string to lower case and string to upper case. | |This basically means string to lower case and string to upper case. | ||
|- | |- | ||
| − | | | + | |00:58 |
|So if we have our string that equals 'HELLO', I can say echo str to lower and show the value of the string in there. | |So if we have our string that equals 'HELLO', I can say echo str to lower and show the value of the string in there. | ||
|- | |- | ||
| − | | | + | |01:12 |
|The 'HELLO' in capitals will now become lowercase. | |The 'HELLO' in capitals will now become lowercase. | ||
|- | |- | ||
| − | | | + | |01:15 |
|Something similar would happen if I were to say this is 'hello' in smallcase | |Something similar would happen if I were to say this is 'hello' in smallcase | ||
|- | |- | ||
| − | | | + | |01:21 |
|And I could say str to upper and that would give me my uppercase version of the string. | |And I could say str to upper and that would give me my uppercase version of the string. | ||
|- | |- | ||
| − | | | + | |01:31 |
|Now one applicable use of this is when you have user-registration. | |Now one applicable use of this is when you have user-registration. | ||
|- | |- | ||
| − | | | + | |01:35 |
|If you have a website on which users have to register, you should usually always store the user name as a lower string. | |If you have a website on which users have to register, you should usually always store the user name as a lower string. | ||
|- | |- | ||
| − | | | + | |01:49 |
|The reason is that if I submit a user name - lets get rid of this... | |The reason is that if I submit a user name - lets get rid of this... | ||
|- | |- | ||
| − | | | + | |01:55 |
|Some people actually do this - Lets have a variable user name which equals say 'ALEX'. | |Some people actually do this - Lets have a variable user name which equals say 'ALEX'. | ||
|- | |- | ||
| − | | | + | |02:01 |
|And I'll put in these also - uppercase and smallcase alphabets. | |And I'll put in these also - uppercase and smallcase alphabets. | ||
|- | |- | ||
| − | | | + | |02:07 |
|Some people use names like this to make the name look funky and its perfectly okay. | |Some people use names like this to make the name look funky and its perfectly okay. | ||
|- | |- | ||
| − | | | + | |02:13 |
|But if the name is stored as this and you think - well did i start with a small a? | |But if the name is stored as this and you think - well did i start with a small a? | ||
|- | |- | ||
| − | | | + | |02:19 |
|Then I have another pattern for username now. | |Then I have another pattern for username now. | ||
|- | |- | ||
| − | | | + | |02:23 |
|So what you can do is say stored user name equals to str to lower of the username. | |So what you can do is say stored user name equals to str to lower of the username. | ||
|- | |- | ||
| − | | | + | |02:29 |
|So this would be the stored username in the database | |So this would be the stored username in the database | ||
|- | |- | ||
| − | | | + | |02:33 |
|Now when they go to login and type in their username in this combination, what we would do is we would convert their typed-in login username to lower case and compare it to the lower case store version of the username. | |Now when they go to login and type in their username in this combination, what we would do is we would convert their typed-in login username to lower case and compare it to the lower case store version of the username. | ||
|- | |- | ||
| − | | | + | |02:48 |
|So we are taking this and storing a lowercase value inside the database and we are comparing it to a typed-in value which has also been converted to lower case | |So we are taking this and storing a lowercase value inside the database and we are comparing it to a typed-in value which has also been converted to lower case | ||
|- | |- | ||
| − | | | + | |02:58 |
|Hence we can't go wrong and users are not going to forget their user-names. | |Hence we can't go wrong and users are not going to forget their user-names. | ||
|- | |- | ||
| − | | | + | |03:07 |
|You could do the same with passwords. | |You could do the same with passwords. | ||
|- | |- | ||
| − | | | + | |03:14 |
|Ok lets go to the next one. | |Ok lets go to the next one. | ||
|- | |- | ||
| − | | | + | |03:22 |
|Sub-string count. This would basically count the no. of sub-strings matching to a particular value inside a string. | |Sub-string count. This would basically count the no. of sub-strings matching to a particular value inside a string. | ||
|- | |- | ||
| − | | | + | |03:31 |
|So here I'll type search equals "My name is alex. What is your name?" | |So here I'll type search equals "My name is alex. What is your name?" | ||
|- | |- | ||
| − | | | + | |03:37 |
|So this is our string. | |So this is our string. | ||
|- | |- | ||
| − | | | + | |03:41 |
|Now if I say we need to echo out the sub-string count... | |Now if I say we need to echo out the sub-string count... | ||
|- | |- | ||
| − | | | + | |03:49 |
|and obviously this stands for sub-string-count, what we want to do is, we want to search our 'search' string... | |and obviously this stands for sub-string-count, what we want to do is, we want to search our 'search' string... | ||
|- | |- | ||
| − | | | + | |04:01 |
|and we will specify a string to search for. Now this will return an integer if we put this in a variable called result. | |and we will specify a string to search for. Now this will return an integer if we put this in a variable called result. | ||
|- | |- | ||
| − | | | + | |04:12 |
|That's because you can't find any instance of a word which will appear say for 1.2 times. | |That's because you can't find any instance of a word which will appear say for 1.2 times. | ||
|- | |- | ||
| − | | | + | |04:20 |
|Also the variable result will not return 2 as t-w-o. It will only return 2 as an integer. | |Also the variable result will not return 2 as t-w-o. It will only return 2 as an integer. | ||
|- | |- | ||
| − | | | + | |04:30 |
|So this is quite useful if we are using substring count to search for, lets say, 'alex'. | |So this is quite useful if we are using substring count to search for, lets say, 'alex'. | ||
|- | |- | ||
| − | | | + | |04:36 |
|And then it will echo out on its own. | |And then it will echo out on its own. | ||
|- | |- | ||
| − | | | + | |04:39 |
|And if you look through here, you will see there is only one instance of 'alex' | |And if you look through here, you will see there is only one instance of 'alex' | ||
|- | |- | ||
| − | | | + | |04:44 |
|So refresh that - and we should get the number 1. | |So refresh that - and we should get the number 1. | ||
|- | |- | ||
| − | | | + | |04:46 |
|Now if we were to search for 'name' - there's 1 instance of 'name' here and another instance of 'name' here | |Now if we were to search for 'name' - there's 1 instance of 'name' here and another instance of 'name' here | ||
|- | |- | ||
| − | | | + | |04:52 |
|So when we refresh, we should get the value 2. | |So when we refresh, we should get the value 2. | ||
|- | |- | ||
| − | | | + | |04:55 |
|Now there are optional parameters for this, which are 'where to start from in a string' and 'where to end in a string'. | |Now there are optional parameters for this, which are 'where to start from in a string' and 'where to end in a string'. | ||
|- | |- | ||
| − | | | + | |05:02 |
|Lets try this out. | |Lets try this out. | ||
|- | |- | ||
| − | | | + | |05:05 |
|So lets say I want to search from after name, ok? | |So lets say I want to search from after name, ok? | ||
|- | |- | ||
| − | | | + | |05:11 |
|So this is 0 1 2 3 4 5 6. | |So this is 0 1 2 3 4 5 6. | ||
|- | |- | ||
| − | | | + | |05:14 |
|So I say search name from 7 onwards. | |So I say search name from 7 onwards. | ||
|- | |- | ||
| − | | | + | |05:19 |
|So search name from 7 and it will search in this blue area that I have highlighted here. | |So search name from 7 and it will search in this blue area that I have highlighted here. | ||
|- | |- | ||
| − | | | + | |05:25 |
|It will only return 1 in the result. | |It will only return 1 in the result. | ||
|- | |- | ||
| − | | | + | |05:28 |
|So you can specify whereabouts in the string. | |So you can specify whereabouts in the string. | ||
|- | |- | ||
| − | | | + | |05:30 |
|I think you can specify upto where. | |I think you can specify upto where. | ||
|- | |- | ||
| − | | | + | |05:33 |
|So this is 7... 8 9 10 11 12 13 14 15 16. | |So this is 7... 8 9 10 11 12 13 14 15 16. | ||
|- | |- | ||
| − | | | + | |05:43 |
|7 to 17. Lets check if this works. | |7 to 17. Lets check if this works. | ||
|- | |- | ||
| − | | | + | |05:46 |
|It shows zero. So from 7 to 17 - which is from about here to here - we find zero instances of 'name'. | |It shows zero. So from 7 to 17 - which is from about here to here - we find zero instances of 'name'. | ||
|- | |- | ||
| − | | | + | |05:55 |
|However if we search for 'alex', we will find 1 instance of it. | |However if we search for 'alex', we will find 1 instance of it. | ||
|- | |- | ||
| − | | | + | |06:01 |
|Ok - so that's the substring count function. | |Ok - so that's the substring count function. | ||
|- | |- | ||
| − | | | + | |06:07 |
|And now substring replace is similar. | |And now substring replace is similar. | ||
|- | |- | ||
| − | | | + | |06:12 |
|Its not the same function but it includes an added bonus where you can replace your string. | |Its not the same function but it includes an added bonus where you can replace your string. | ||
|- | |- | ||
| − | | | + | |06:18 |
|So the replace tags are - My name is alex and I've added the full-stop on purpose. | |So the replace tags are - My name is alex and I've added the full-stop on purpose. | ||
|- | |- | ||
| − | | | + | |06:28 |
|Our result is equal to substring replace. | |Our result is equal to substring replace. | ||
|- | |- | ||
| − | | | + | |06:33 |
|What do I want to replace in? I want to replace in the variable replace. | |What do I want to replace in? I want to replace in the variable replace. | ||
|- | |- | ||
| − | | | + | |06:41 |
|And I want to replace 'alex' with 'billy'. | |And I want to replace 'alex' with 'billy'. | ||
|- | |- | ||
| − | | | + | |06:48 |
|And this will be from - let me count 0 1 2 3 4 5 7 8 9 10 11 so from 11 until... | |And this will be from - let me count 0 1 2 3 4 5 7 8 9 10 11 so from 11 until... | ||
|- | |- | ||
| − | | | + | |07:01 |
|Its 11 - 0 1 2 3 4 5 6 7 8 9 10 11 - from 11 to 14. | |Its 11 - 0 1 2 3 4 5 6 7 8 9 10 11 - from 11 to 14. | ||
|- | |- | ||
| − | | | + | |07:14 |
|So that should replace 'alex' with 'billy'. | |So that should replace 'alex' with 'billy'. | ||
|- | |- | ||
| − | | | + | |07:19 |
|Replace and refresh. | |Replace and refresh. | ||
|- | |- | ||
| − | | | + | |07:21 |
|Oh! We didn't echo out result. | |Oh! We didn't echo out result. | ||
|- | |- | ||
| − | | | + | |07:23 |
|Lets echo out result and we can refresh this. | |Lets echo out result and we can refresh this. | ||
|- | |- | ||
| − | | | + | |07:26 |
|And it should return my name is billy. | |And it should return my name is billy. | ||
|- | |- | ||
| − | | | + | |07:30 |
|This should be 12 and this 15, I think. | |This should be 12 and this 15, I think. | ||
|- | |- | ||
| − | | | + | |07:34 |
|Or in fact no - it should be 10 and 14. | |Or in fact no - it should be 10 and 14. | ||
|- | |- | ||
| − | | | + | |07:38 |
|No, not quite right.... We are missing the full-stop. | |No, not quite right.... We are missing the full-stop. | ||
|- | |- | ||
| − | | | + | |07:43 |
|........ so lets go for 11 and 14. | |........ so lets go for 11 and 14. | ||
|- | |- | ||
| − | | | + | |07:49 |
|Still missing the full stop and I cant think why. | |Still missing the full stop and I cant think why. | ||
|- | |- | ||
| − | | | + | |07:52 |
|aah! well you get the picture | |aah! well you get the picture | ||
|- | |- | ||
| − | | | + | |07:55 |
|Basically you can replace anything in the string with the starting value and the ending value | |Basically you can replace anything in the string with the starting value and the ending value | ||
|- | |- | ||
| − | | | + | |07:59 |
|It will leave it up to you to count through. | |It will leave it up to you to count through. | ||
|- | |- | ||
| − | | | + | |08:04 |
|I'm very tired so I am not able to count. | |I'm very tired so I am not able to count. | ||
|- | |- | ||
| − | | | + | |08:09 |
|So what we are doing here is we are replacing a particular string with a particular value | |So what we are doing here is we are replacing a particular string with a particular value | ||
|- | |- | ||
| − | | | + | |08:14 |
|And here's your starting value and here's your finishing value. | |And here's your starting value and here's your finishing value. | ||
|- | |- | ||
| − | | | + | |08:17 |
|That's all in this tutorial. | |That's all in this tutorial. | ||
|- | |- | ||
| − | | | + | |08:19 |
|There are many more string functions and I suggest you to search, may be, on 'google'. | |There are many more string functions and I suggest you to search, may be, on 'google'. | ||
|- | |- | ||
| − | | | + | |08:24 |
|Search for 'php string functions' and you'll find a lot of interesting functions. | |Search for 'php string functions' and you'll find a lot of interesting functions. | ||
|- | |- | ||
| − | | | + | |08:28 |
|If you are looking to do a particular thing there's probably a function available for it. | |If you are looking to do a particular thing there's probably a function available for it. | ||
|- | |- | ||
| − | | | + | |08:33 |
|Thanks for watching! This is Osama Butt dubbing for the Spoken Tutorial Project. | |Thanks for watching! This is Osama Butt dubbing for the Spoken Tutorial Project. | ||
Revision as of 12:37, 10 July 2014
| Time | Narration |
| 00:00 | Ok back to the second part of the String Functions tutorial. |
| 00:03 | I'm going to go through the rest of the functions starting from String Reverse. |
| 00:08 | String reverse probably to make sense is s-t-r-rev. |
| 00:11 | So what strvev does is it reverses the contents of a string. |
| 00:20 | So if I were to say 'Hello' and I were to reverse that, it would be "o-l-l-e-H". |
| 00:30 | And it can be useful in some circumstances although you usually wouldn't use this. |
| 00:36 | But you could use this function if you want to specifically reverse a string. |
| 00:41 | I think its a useful and fun function to use. |
| 00:45 | Ok - the next set of functions I have grouped together are these: str to lower and str to upper. |
| 00:54 | This basically means string to lower case and string to upper case. |
| 00:58 | So if we have our string that equals 'HELLO', I can say echo str to lower and show the value of the string in there. |
| 01:12 | The 'HELLO' in capitals will now become lowercase. |
| 01:15 | Something similar would happen if I were to say this is 'hello' in smallcase |
| 01:21 | And I could say str to upper and that would give me my uppercase version of the string. |
| 01:31 | Now one applicable use of this is when you have user-registration. |
| 01:35 | If you have a website on which users have to register, you should usually always store the user name as a lower string. |
| 01:49 | The reason is that if I submit a user name - lets get rid of this... |
| 01:55 | Some people actually do this - Lets have a variable user name which equals say 'ALEX'. |
| 02:01 | And I'll put in these also - uppercase and smallcase alphabets. |
| 02:07 | Some people use names like this to make the name look funky and its perfectly okay. |
| 02:13 | But if the name is stored as this and you think - well did i start with a small a? |
| 02:19 | Then I have another pattern for username now. |
| 02:23 | So what you can do is say stored user name equals to str to lower of the username. |
| 02:29 | So this would be the stored username in the database |
| 02:33 | Now when they go to login and type in their username in this combination, what we would do is we would convert their typed-in login username to lower case and compare it to the lower case store version of the username. |
| 02:48 | So we are taking this and storing a lowercase value inside the database and we are comparing it to a typed-in value which has also been converted to lower case |
| 02:58 | Hence we can't go wrong and users are not going to forget their user-names. |
| 03:07 | You could do the same with passwords. |
| 03:14 | Ok lets go to the next one. |
| 03:22 | Sub-string count. This would basically count the no. of sub-strings matching to a particular value inside a string. |
| 03:31 | So here I'll type search equals "My name is alex. What is your name?" |
| 03:37 | So this is our string. |
| 03:41 | Now if I say we need to echo out the sub-string count... |
| 03:49 | and obviously this stands for sub-string-count, what we want to do is, we want to search our 'search' string... |
| 04:01 | and we will specify a string to search for. Now this will return an integer if we put this in a variable called result. |
| 04:12 | That's because you can't find any instance of a word which will appear say for 1.2 times. |
| 04:20 | Also the variable result will not return 2 as t-w-o. It will only return 2 as an integer. |
| 04:30 | So this is quite useful if we are using substring count to search for, lets say, 'alex'. |
| 04:36 | And then it will echo out on its own. |
| 04:39 | And if you look through here, you will see there is only one instance of 'alex' |
| 04:44 | So refresh that - and we should get the number 1. |
| 04:46 | Now if we were to search for 'name' - there's 1 instance of 'name' here and another instance of 'name' here |
| 04:52 | So when we refresh, we should get the value 2. |
| 04:55 | Now there are optional parameters for this, which are 'where to start from in a string' and 'where to end in a string'. |
| 05:02 | Lets try this out. |
| 05:05 | So lets say I want to search from after name, ok? |
| 05:11 | So this is 0 1 2 3 4 5 6. |
| 05:14 | So I say search name from 7 onwards. |
| 05:19 | So search name from 7 and it will search in this blue area that I have highlighted here. |
| 05:25 | It will only return 1 in the result. |
| 05:28 | So you can specify whereabouts in the string. |
| 05:30 | I think you can specify upto where. |
| 05:33 | So this is 7... 8 9 10 11 12 13 14 15 16. |
| 05:43 | 7 to 17. Lets check if this works. |
| 05:46 | It shows zero. So from 7 to 17 - which is from about here to here - we find zero instances of 'name'. |
| 05:55 | However if we search for 'alex', we will find 1 instance of it. |
| 06:01 | Ok - so that's the substring count function. |
| 06:07 | And now substring replace is similar. |
| 06:12 | Its not the same function but it includes an added bonus where you can replace your string. |
| 06:18 | So the replace tags are - My name is alex and I've added the full-stop on purpose. |
| 06:28 | Our result is equal to substring replace. |
| 06:33 | What do I want to replace in? I want to replace in the variable replace. |
| 06:41 | And I want to replace 'alex' with 'billy'. |
| 06:48 | And this will be from - let me count 0 1 2 3 4 5 7 8 9 10 11 so from 11 until... |
| 07:01 | Its 11 - 0 1 2 3 4 5 6 7 8 9 10 11 - from 11 to 14. |
| 07:14 | So that should replace 'alex' with 'billy'. |
| 07:19 | Replace and refresh. |
| 07:21 | Oh! We didn't echo out result. |
| 07:23 | Lets echo out result and we can refresh this. |
| 07:26 | And it should return my name is billy. |
| 07:30 | This should be 12 and this 15, I think. |
| 07:34 | Or in fact no - it should be 10 and 14. |
| 07:38 | No, not quite right.... We are missing the full-stop. |
| 07:43 | ........ so lets go for 11 and 14. |
| 07:49 | Still missing the full stop and I cant think why. |
| 07:52 | aah! well you get the picture |
| 07:55 | Basically you can replace anything in the string with the starting value and the ending value |
| 07:59 | It will leave it up to you to count through. |
| 08:04 | I'm very tired so I am not able to count. |
| 08:09 | So what we are doing here is we are replacing a particular string with a particular value |
| 08:14 | And here's your starting value and here's your finishing value. |
| 08:17 | That's all in this tutorial. |
| 08:19 | There are many more string functions and I suggest you to search, may be, on 'google'. |
| 08:24 | Search for 'php string functions' and you'll find a lot of interesting functions. |
| 08:28 | If you are looking to do a particular thing there's probably a function available for it. |
| 08:33 | Thanks for watching! This is Osama Butt dubbing for the Spoken Tutorial Project. |
