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

|Ok back to the second part of the String Functions tutorial.

|I'm going to go through the rest of the functions starting from String Reverse.

|String reverse probably to make sense is s-t-r-rev.

|So what strvev does is it reverses the contents of a string.

|I think its a useful and fun function to use.

|Ok - the next set of functions I have grouped together are these: str to lower and str to upper.

|This basically means string to lower case and string to upper case.

|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.

|Something similar would happen if I were to say this is 'hello' in smallcase

|And I could say str to upper and that would give me my uppercase version of the string.

|Now one applicable use of this is when you have user-registration.

|The reason is that if I submit a user name - lets get rid of this...

|Some people actually do this - Lets have a variable user name which equals say 'ALEX'.

|And I'll put in these also - uppercase and smallcase alphabets.

|But if the name is stored as this and you think - well did i start with a small a?   

|So what you can do is say stored user name equals to str to lower of the username.

|So this would be the stored username in the database  

|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.

|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

|Hence we can't go wrong and users are not going to forget their user-names.

|Ok lets go to the next one.  

|Sub-string count. This would basically count the no. of sub-strings matching to a particular value inside a string.

|So here I'll type search equals "My name is alex. What is your name?"

|So this is our string.

|Now if I say we need to echo out the sub-string count...

|and obviously this stands for sub-string-count, what we want to do is, we want to search our 'search' string...

|and we will specify a string to search for.  Now this will return an integer if we put this in a variable called result.

|Also the variable result will not return 2 as t-w-o.  It will only return 2 as an integer.

|So this is quite useful if we are using substring count to search for, lets say, 'alex'.

|And then it will echo out on its own.

|And if you look through here, you will see there is only one instance of 'alex'

|So refresh that - and we should get the number 1.

|Now if we were to search for 'name' - there's 1 instance of 'name' here and another instance of 'name' here  

|So when we refresh, we should get the value 2.

|Now there are optional parameters for this, which are 'where to start from in a string' and 'where to end in a string'.

|Lets try this out.

|So lets say I want to search from after name, ok?

|So I say search name from 7 onwards.

|So search name from 7 and it will search in this blue area that I have highlighted here.

|So you can specify whereabouts in the string.

|I think you can specify upto where.   

|7 to 17.  Lets check if this works.

|Ok - so that's the substring count function.

|And now substring replace is similar.

|Its not the same function but it includes an added bonus where you can replace your string.

|Our result is equal to substring replace.

|What do I want to replace in? I want to replace in the variable replace.

|Its 11 - 0 1 2 3 4 5 6 7 8 9 10 11  - from 11 to 14.  

|Oh! We didn't echo out result.

|Lets echo out result and we can refresh this.

|And it should return my name is billy.

|........ so lets go for 11 and 14.

|aah! well you get the picture

|Basically you can replace anything in the string with the starting value and the ending value  

|I'm very tired so I am not able to count.

|So what we are doing here is we are replacing a particular string with a particular value

|Thanks for watching!  This is Osama Butt dubbing for the Spoken Tutorial Project.