Difference between revisions of "PHP-and-MySQL/C4/PHP-String-Functions-Part-2/English-timed"
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{|Border=1 | {|Border=1 | ||
| − | + | |'''Time''' | |
| − | + | |'''Narration''' | |
|- | |- | ||
| − | | | + | |00:00 |
| − | |Ok | + | |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 | + | |I think it's 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 | + | |So, if we have our '$string' that equals 'HELLO', I can say '''echo''' str to lower and show the value of the $string in here. |
|- | |- | ||
| − | | | + | |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 | + | |Something similar would happen if I were to say this is 'hello' in small case. |
|- | |- | ||
| − | | | + | |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 - | + | |The reason is that if I submit a user name - let's get rid of this... |
|- | |- | ||
| − | | | + | |01:55 |
| − | |Some people actually do this - | + | |Some people actually do this - Let's have a variable user name which equals say 'ALEX'. |
|- | |- | ||
| − | | | + | |02:01 |
| − | |And I'll put in these also - uppercase and | + | |And I'll put in these also - uppercase and small case 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 | + | |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 '''$username'''. |
|- | |- | ||
| − | | | + | |02:29 |
| − | |So this would be the stored username in the database | + | |So, this would be the stored username in the database. |
|- | |- | ||
| − | | | + | |02:33 |
| − | |Now when they go to login and type in their username in this combination, what we would do is we would convert their typed-in login username to lower case and compare it to the lower case | + | |Now, when they go to login and type in their 'username' in this combination, what we would do is we would convert their typed-in login 'username' to lower case and compare it to the lower case stored version of the 'username'. |
|- | |- | ||
| − | | | + | |02:48 |
| − | |So we are taking this and storing a lowercase value inside the database and we are comparing it to a typed-in value which has also been converted to lower case | + | |So, we are taking this and storing a lowercase value inside the database and we are comparing it to a typed-in value which has also been converted to lower case. |
|- | |- | ||
| − | | | + | |02:58 |
| − | |Hence we can't go wrong and users are not going to forget their user-names. | + | |Hence, we can't go wrong and users are not going to forget their user-names. |
|- | |- | ||
| − | | | + | |03:07 |
|You could do the same with passwords. | |You could do the same with passwords. | ||
|- | |- | ||
| − | | | + | |03:14 |
| − | |Ok | + | |Ok. let's go to the next one. |
|- | |- | ||
| − | | | + | |03:22 |
| − | |Sub-string count. This would basically count the no. of sub-strings matching to a particular value inside a string. | + | |'''Sub-string count'''. This would basically count the no. of '''sub-strings''' matching to a particular value inside a string. |
|- | |- | ||
| − | | | + | |03:31 |
| − | |So here I'll type search equals "My name is alex. What is your name?" | + | |So, here I'll type '''$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 | + | |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 |
| − | | | + | |Let's try this out. |
|- | |- | ||
| − | | | + | |05:05 |
| − | |So | + | |So let's 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 | + | |I think you can specify up to 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. | + | |7 to 17. Let's 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 |
| − | | | + | |It's 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 |
| − | | | + | |It's 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 '''$result'''. |
|- | |- | ||
| − | | | + | |07:23 |
| − | | | + | |Let's '''echo''' out '''$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 | + | |........ so let's 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. |
|- | |- | ||
| − | | | + | |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. |
Latest revision as of 13:02, 3 June 2015
| 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 it's 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 here. |
| 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 small case. |
| 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 - let's get rid of this... |
| 01:55 | Some people actually do this - Let's have a variable user name which equals say 'ALEX'. |
| 02:01 | And I'll put in these also - uppercase and small case 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 stored 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. let's 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 | Let's try this out. |
| 05:05 | So let's 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 up to where. |
| 05:33 | So this is 7... 8 9 10 11 12 13 14 15 16. |
| 05:43 | 7 to 17. Let's 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 | It's 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 | It's 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 | Let's 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 let's 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. |
