Difference between revisions of "PHP-and-MySQL/C4/PHP-String-Functions-Part-2/English-timed"

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{|Border=1
 
{|Border=1
−
!Time
+
|'''Time'''
−
!Narration
+
|'''Narration'''
 
|-
 
|-
−
|0:00
+
|00:00
−
|Ok back to the second part of the String Functions tutorial.
+
|Ok. Back to the second part of the '''String Functions''' tutorial.
 
|-
 
|-
−
|0:03
+
|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'''.
 
|-
 
|-
−
|0:08
+
|00:08
−
|String reverse probably to make sense is s-t-r-rev.
+
|'''String reverse''' probably to make sense is s-t-r-rev.
 
|-
 
|-
−
|0:11
+
|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'''.
 
|-
 
|-
−
|0:20
+
|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".
 
|-
 
|-
−
|0:30
+
|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.
 
|-
 
|-
−
|0:36
+
|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.
 
|-
 
|-
−
|0:41
+
|00:41
−
|I think its a useful and fun function to use.
+
|I think it's a useful and fun function to use.
 
|-
 
|-
−
|0:45
+
|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()'''.
 
|-
 
|-
−
|0:54
+
|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.
 
|-
 
|-
−
|0:58
+
|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 here.
 
|-
 
|-
−
|1:12
+
|01:12
 
|The 'HELLO' in capitals will now become lowercase.
 
|The 'HELLO' in capitals will now become lowercase.
 
|-
 
|-
−
|1:15
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|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 small case.
 
|-
 
|-
−
|1:21
+
|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'''.
 
|-
 
|-
−
|1:31
+
|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.
 
|-
 
|-
−
|1:35
+
|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.
 
|-
 
|-
−
|1:49
+
|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 - let's get rid of this...
 
|-
 
|-
−
|1:55
+
|01:55
−
|Some people actually do this - Lets have a variable user name which equals say 'ALEX'.
+
|Some people actually do this - Let's have a variable user name which equals say 'ALEX'.
 
|-
 
|-
−
|2:01
+
|02:01
−
|And I'll put in these also - uppercase and smallcase alphabets.
+
|And I'll put in these also - uppercase and small case alphabets.
 
|-
 
|-
−
|2:07
+
|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.
 
|-
 
|-
−
|2:13
+
|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'?   
 
|-
 
|-
−
|2:19
+
|02:19
 
|Then I have another pattern for username now.
 
|Then I have another pattern for username now.
 
|-
 
|-
−
|2:23
+
|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'''.
 
|-
 
|-
−
|2:29
+
|02:29
−
|So this would be the stored username in the database  
+
|So, this would be the stored username in the database.
 
|-
 
|-
−
|2:33
+
|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 stored version of the 'username'.
 
|-
 
|-
−
|2:48
+
|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.
 
|-
 
|-
−
|2:58
+
|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.
 
|-
 
|-
−
|3:07
+
|03:07
 
|You could do the same with passwords.
 
|You could do the same with passwords.
 
|-
 
|-
−
|3:14
+
|03:14
−
|Ok lets go to the next one.  
+
|Ok. let's go to the next one.  
 
|-
 
|-
−
|3:22
+
|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.
 
|-
 
|-
−
|3:31
+
|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?".
 
|-
 
|-
−
|3:37
+
|03:37
−
|So this is our string.
+
|So, this is our '''string'''.
 
|-
 
|-
−
|3:41
+
|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()'''...
 
|-
 
|-
−
|3:49
+
|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...
 
|-
 
|-
−
|4:01
+
|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'''.
 
|-
 
|-
−
|4:12
+
|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.
 
|-
 
|-
−
|4:20
+
|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.
 
|-
 
|-
−
|4:30
+
|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'.
 
|-
 
|-
−
|4:36
+
|04:36
−
|And then it will echo out on its own.
+
|And then it will '''echo''' out on its own.
 
|-
 
|-
−
|4:39
+
|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'.
 
|-
 
|-
−
|4:44
+
|04:44
−
|So refresh that - and we should get the number 1.
+
|So, refresh that - and we should get the number 1.
 
|-
 
|-
−
|4:46
+
|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.
 
|-
 
|-
−
|4:52
+
|04:52
−
|So when we refresh, we should get the value 2.
+
|So, when we refresh, we should get the value 2.
 
|-
 
|-
−
|4:55
+
|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'.
 
|-
 
|-
−
|5:02
+
|05:02
−
|Lets try this out.
+
|Let's try this out.
 
|-
 
|-
−
|5:05
+
|05:05
−
|So lets say I want to search from after name, ok?
+
|So let's say- I want to search from after "name", ok?
 
|-
 
|-
−
|5:11
+
|05:11
 
|So this is 0 1 2 3 4 5 6.
 
|So this is 0 1 2 3 4 5 6.
 
|-
 
|-
−
|5:14
+
|05:14
−
|So I say search name from 7 onwards.
+
|So, I say search "name" from 7 onwards.
 
|-
 
|-
−
|5:19
+
|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.
 
|-
 
|-
−
|5:25
+
|05:25
 
|It will only return 1 in the result.
 
|It will only return 1 in the result.
 
|-
 
|-
−
|5:28
+
|05:28
−
|So you can specify whereabouts in the string.
+
|So, you can specify whereabouts in the string.
 
|-
 
|-
−
|5:30
+
|05:30
−
|I think you can specify upto where.   
+
|I think you can specify up to where.   
 
|-
 
|-
−
|5:33
+
|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.  
 
|-
 
|-
−
|5:43
+
|05:43
−
|7 to 17.  Lets check if this works.
+
|7 to 17.  Let's check if this works.
 
|-
 
|-
−
|5:46
+
|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'.  
 
|-
 
|-
−
|5:55
+
|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.
 
|-
 
|-
−
|6:01
+
|06:01
−
|Ok - so that's the substring count function.
+
|Ok - so that's the '''substring count()''' function.
 
|-
 
|-
−
|6:07
+
|06:07
−
|And now substring replace is similar.
+
|And now '''substring replace()''' is similar.
 
|-
 
|-
−
|6:12
+
|06:12
−
|Its not the same function but it includes an added bonus where you can replace your string.
+
|It's not the same function but it includes an added bonus where you can replace your string.
 
|-
 
|-
−
|6:18
+
|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.
 
|-
 
|-
−
|6:28
+
|06:28
−
|Our result is equal to substring replace.
+
|Our '''$result''' is equal to '''substring replace()'''.
 
|-
 
|-
−
|6:33
+
|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'''.
 
|-
 
|-
−
|6:41
+
|06:41
 
|And I want to replace 'alex' with 'billy'.
 
|And I want to replace 'alex' with 'billy'.
 
|-
 
|-
−
|6:48
+
|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...
 
|-
 
|-
−
|7:01
+
|07:01
−
|Its 11 - 0 1 2 3 4 5 6 7 8 9 10 11  - from 11 to 14.  
+
|It's 11 - 0 1 2 3 4 5 6 7 8 9 10 11  - from 11 to 14.  
 
|-
 
|-
−
|7:14
+
|07:14
 
|So that should replace 'alex' with 'billy'.
 
|So that should replace 'alex' with 'billy'.
 
|-
 
|-
−
|7:19
+
|07:19
 
|Replace and refresh.
 
|Replace and refresh.
 
|-
 
|-
−
|7:21
+
|07:21
−
|Oh! We didn't echo out result.
+
|Oh! We didn't '''echo''' out '''$result'''.
 
|-
 
|-
−
|7:23
+
|07:23
−
|Lets echo out result and we can refresh this.
+
|Let's '''echo''' out '''$result''' and we can refresh this.
 
|-
 
|-
−
|7:26
+
|07:26
−
|And it should return my name is billy.
+
|And it should return my name is "billy".
 
|-
 
|-
−
|7:30
+
|07:30
 
|This should be 12 and this 15, I think.
 
|This should be 12 and this 15, I think.
 
|-
 
|-
−
|7:34
+
|07:34
 
|Or in fact no - it should be 10 and 14.
 
|Or in fact no - it should be 10 and 14.
 
|-
 
|-
−
|7:38
+
|07:38
 
|No, not quite right.... We are missing the full-stop.
 
|No, not quite right.... We are missing the full-stop.
 
|-
 
|-
−
|7:43
+
|07:43
−
|........ so lets go for 11 and 14.
+
|........ so let's go for 11 and 14.
 
|-
 
|-
−
|7:49
+
|07:49
 
|Still missing the full stop and I cant think why.
 
|Still missing the full stop and I cant think why.
 
|-
 
|-
−
|7:52
+
|07:52
−
|aah! well you get the picture
+
|Aah! well you get the picture.
 
|-
 
|-
−
|7:55
+
|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.
 
|-
 
|-
−
|7:59
+
|07:59
 
|It will leave it up to you to count through.
 
|It will leave it up to you to count through.
 
|-
 
|-
−
|8:04
+
|08:04
−
|I'm very tired so I am not able to count.
+
|I'm very tired, so I am not able to count.
 
|-
 
|-
−
|8:09
+
|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.
 
|-
 
|-
−
|8:14
+
|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.
 
|-
 
|-
−
|8:17
+
|08:17
 
|That's all in this tutorial.
 
|That's all in this tutorial.
 
|-
 
|-
−
|8:19
+
|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'.
 
|-
 
|-
−
|8:24
+
|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.
 
|-
 
|-
−
|8:28
+
|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.
 
|-
 
|-
−
|8:33
+
|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.

Contributors and Content Editors

Gyan, Pratik kamble, Sandhya.np14

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