I think your tutorials are the best. Finally, I know how to use PHP practically. I like the way you keep things simple, no complicating matters. Indeed, simplicity is the ultimate sophistication.
Good tutorials man :) I just have to clarify that the function is not looking for $x. You can call a variable inside the parameters any way you want(like $y). What matters is what you pass trough to that function when you are calling it in newCalc(&x). We are passing value 100 that is contained inside $x and function takes it and saves it into $y.
Or you can do like this if you don't want to pass it: $x = 100; function newCalc() { global $x; $newnumber = $x * 0.75; echo "Here is 75% of what you wrote: $newnumber"; } newCalc(); But you should rarely do this with functions, you should pass arguments. However, I have found cases where it is useful in Python when making a package, and I'm sure there are cases in PHP where it would be useful.
that's true. The function parameters is local to the function itself, you can name the parameters anything you want because it is not related to the variables you named globally
*Expand this comment if you're a beginner who is confused. *Note for non-beginner programmers: from within the local scope of a function, a global variable can only be accessed if you first write the keyword 'global' before the variable name. There's also a PHP defined array named $GLOBALS that uses the name of the globally defined variable as the accessor(e.g., $GLOBALS['varName']) I love all of your videos so far. I think that this video is treading dangerous territory. I'm sure you go over this later on(confirmed that he does), but I believe this video should have directly addressed what variable scope is. The explanation of functions was uncharacteristically unorganized from what I've seen of your tutorials. I believe you should have explained functions that don't take arguments. Then explained functions that do take arguments. Then explained that functions can return values as well. I know when teaching about programming, sometimes it's best to just say "we'll explain why later". In this case, I think the order in which things are discussed could easily be confusing. If you are confused I recommend looking at this page: www.w3schools.com/php/php_variables.asp Specifically the section about scope that talks about local and global scope and how to access a global variable from within a function. Also look at this page: www.tutorialspoint.com/php/php_functions.htm Specifically the sections: Creating PHP Function, PHP Functions with Parameters, Passing Arguments by Reference, and PHP Functions returning value. It may seem like it's a lot of material, but It's all straightforward and are consistent properties of most programming languages, which is why even though I'm learning php like you, I understand those concepts. I don't think it will take much time at all to absorb what you need to know.
super glad i read this. coming from java, i was a bit confused why you couldn't just use a non-local variable, especially as I had already made some code which I had instantiated a class and used $this to assign a variable outside the function. edit. infact the video is really weird about explaining local variables
I think it's kinda confusing the newbies. the function does NOT look for the variable from outside but we simply pass the value/parameters to the function and it doesn't matter what will the name of the variable that has been passed to the function be. you just have to pass the parameters in the same order.
So to sum up: Parameters in the functions is like bridges between external code (outside of the function) and inside code (between { }). Everything I wont to pass from function our in function need to go through parameters?
i'm very sorry, i thought i subscribed to you channel long time. you are really a pro and a teacher. i love your explanations very much. even if you sell your tutorials to me for $1000000000000 i will buy
just a doubt: why not use the break inside the function itself. i mean the line where you've written echo "This is 75% of what you've written".$newnr. "". That way you can actually avoid writting echo "" all the time
Hi Dani, great content. One question, how do I create an open variable, where the user is the one that inputs the value so that the answer will vary accordingly??
I dont have the funds to donate on patreon, but I really appreciate the free learning you offer- you're a fantastic teacher so i white-listed your TH-cam account on adblock just to give you that little ad revenue. Thanks Daniel.
Hi, thank you for the tutorial.. but have a question.. you created a function with variable $x.. after that you changed the variable to $a.. but you did not change the insider of that function.. but it worked...! how? need a little bit more please.. :-) I'm new in php, you can tell.
The $x inside the function is just a placeholder :) it is just there to show where inside the function it should continue to use whatever you place in the function when we use it later on.
good stuff...what I don't really get is that lessons seem to show how code reacts to values put in by the programmer.... how do values (that always change) by random users on a website for example get processed?
one question on Functions, how does the function process the expressions within the ()brackets by default? by reference? or by value? the way you expressed it in this video it seems that it is by reference, but one statement you made makes it sound like it process by value as well. however, you did not define it as by ref or by val.
Hi Rhys. I think that when you define the function, it proccess the expression within the bracket as a reference and when you call it as a value. I'm not 100% sure about that, but I think that's how it works.
In your first line of code you put a variable $x in the parentheses. $x is present outside and so is $a so why not put $a in there instead of $x? And it would be easier to uN if the parentheses remained empty
if you put for example a $x in parantheses means that your function need to get a value from user For example : function myFunc($x) { if ($x % 2 == 0){ echo 'the number is even'; } else { echo 'the number is odd'; } } //now you give a value to your function myFunc(20); //here you can put any number and it goes instead of x in function //now if you check your browser it shoud tell that the number is even //if you put 5 it tells that the number is odd i hope you got that
Someone please explain: the function newcalc deals with $x and in said code $newnr is multiplying $x by 0.75 for its value. So. How can calling newCalc($a) actives the function? When $newnr is using the value of $x???
You're conflating variables and parameters. You could just as easily omit the global variable $x and just pass the parameter as a number in the function call that will be used by reference. I'd highly avoid this type of name collision as it's really hard to follow the code flow. The function isn't 'looking' for a variable anywhere other than as the parameter in the function's invocation. function(2) for instance. It just assigns 2 to $x and then runs the function. You're passing the value of $x by reference to the invocation, which is then (confusingly) assigning it to a local variable of the same name. You can test it by changing the variable name to $n in the global scope and the function parameter and it will still work as intended. 👍
You didn't mention the use of return inside a function, and the possibility of inputing different parameters separated by a comma. Thats something pretty basic.
I think your tutorials are the best. Finally, I know how to use PHP practically. I like the way you keep things simple, no complicating matters. Indeed, simplicity is the ultimate sophistication.
these are so good. All the other videos I've seen feel like they're not teaching you at all they just show you that *they* can do it...
I have watch many php program toturial..... But you are the only one why simplify for the lane man.....thank you very much
Good tutorials man :) I just have to clarify that the function is not looking for $x. You can call a variable inside the parameters any way you want(like $y). What matters is what you pass trough to that function when you are calling it in newCalc(&x). We are passing value 100 that is contained inside $x and function takes it and saves it into $y.
good call, was wondering the same thing
Or you can do like this if you don't want to pass it:
$x = 100;
function newCalc() {
global $x;
$newnumber = $x * 0.75;
echo "Here is 75% of what you wrote: $newnumber";
}
newCalc();
But you should rarely do this with functions, you should pass arguments. However, I have found cases where it is useful in Python when making a package, and I'm sure there are cases in PHP where it would be useful.
that's true. The function parameters is local to the function itself, you can name the parameters anything you want because it is not related to the variables you named globally
*Expand this comment if you're a beginner who is confused.
*Note for non-beginner programmers: from within the local scope of a function, a global variable can only be accessed if you first write the keyword 'global' before the variable name. There's also a PHP defined array named $GLOBALS that uses the name of the globally defined variable as the accessor(e.g., $GLOBALS['varName'])
I love all of your videos so far. I think that this video is treading dangerous territory. I'm sure you go over this later on(confirmed that he does), but I believe this video should have directly addressed what variable scope is. The explanation of functions was uncharacteristically unorganized from what I've seen of your tutorials. I believe you should have explained functions that don't take arguments. Then explained functions that do take arguments. Then explained that functions can return values as well.
I know when teaching about programming, sometimes it's best to just say "we'll explain why later". In this case, I think the order in which things are discussed could easily be confusing.
If you are confused I recommend looking at this page: www.w3schools.com/php/php_variables.asp
Specifically the section about scope that talks about local and global scope and how to access a global variable from within a function.
Also look at this page: www.tutorialspoint.com/php/php_functions.htm
Specifically the sections: Creating PHP Function, PHP Functions with Parameters, Passing Arguments by Reference, and PHP Functions returning value.
It may seem like it's a lot of material, but It's all straightforward and are consistent properties of most programming languages, which is why even though I'm learning php like you, I understand those concepts. I don't think it will take much time at all to absorb what you need to know.
the parameters inside a function are instead of simply writing $param for example inside the function?
super glad i read this. coming from java, i was a bit confused why you couldn't just use a non-local variable, especially as I had already made some code which I had instantiated a class and used $this to assign a variable outside the function.
edit. infact the video is really weird about explaining local variables
I think it's kinda confusing the newbies. the function does NOT look for the variable from outside but we simply pass the value/parameters to the function and it doesn't matter what will the name of the variable that has been passed to the function be. you just have to pass the parameters in the same order.
Glad to see this comment clearing it all up.
I have a question in minute 6:37, is that a meowing language?
That would be Misse, my wifes cat. 🙂
I just wanna thank you for these awesome tutorials and also thank you for replying my question. I couln't be enjoying this more than I am right now :)
Thank you for these videos, they are absolutely wonderful to compliment my college coursework!!
Thanks sir for such a great teaching. I hope I can study php completely through this chanel.
thank you dan👋 am enjoying your tutorials
Thanks for the video, for a beginner like me it is really easy to understand.
So to sum up:
Parameters in the functions is like bridges between external code (outside of the function) and inside code (between { }).
Everything I wont to pass from function our in function need to go through parameters?
i'm very sorry, i thought i subscribed to you channel long time. you are really a pro and a teacher. i love your explanations very much. even if you sell your tutorials to me for $1000000000000 i will buy
just a doubt: why not use the break inside the function itself. i mean the line where you've written
echo "This is 75% of what you've written".$newnr. "". That way you can actually avoid writting echo "" all the time
Hi, Daniel. Your PHP tutorial is one of the best I have watched. Thank you. Just curious, where you from?
He's from denmark
Best Tutorial thanks a alot
Hi Dani, great content. One question, how do I create an open variable, where the user is the one that inputs the value so that the answer will vary accordingly??
Thank you brother.
echo "75% of $x is $newnr"; Use dubel quotes then you dont need the , or .
Which "theme" and "Color Scheme" did you use in your Sublime text? Please tell me. I like the UI.
Hello! what theme and color scheme does you use?
When you finish the beginer tutorials try sell the next tutorials advanced, i will definitely buy, your tutorials are the best.
Or do the advance for free, and you'll earn your money from youtube.
What ar u ? Donald trump?
I'd pay for advanced tutorials from you as well. Great teacher.
Eos April he has a Patreon account, donate.
Hi Daniel, Thank You for videos. Could You tell me your Sublime Theme name ? or Was it only
an old version?
Also do modules function the same way?
what ide u have used for this course?
I didn't use an IDE, I used a Text Editor named Sublime Text :) However today I have switched over to Atom.
@@Dani_Krossing Thank you
I dont have the funds to donate on patreon, but I really appreciate the free learning you offer- you're a fantastic teacher so i white-listed your TH-cam account on adblock just to give you that little ad revenue. Thanks Daniel.
merci beaucoup
Hi, thank you for the tutorial.. but have a question..
you created a function with variable $x.. after that you changed the variable to $a.. but you did not change the insider of that function.. but it worked...! how? need a little bit more please.. :-)
I'm new in php, you can tell.
The $x inside the function is just a placeholder :) it is just there to show where inside the function it should continue to use whatever you place in the function when we use it later on.
good stuff...what I don't really get is that lessons seem to show how code reacts to values put in by the programmer.... how do values (that always change) by random users on a website for example get processed?
User a form with HTML
one question on Functions, how does the function process the expressions within the ()brackets by default? by reference? or by value? the way you expressed it in this video it seems that it is by reference, but one statement you made makes it sound like it process by value as well. however, you did not define it as by ref or by val.
Hi Rhys.
I think that when you define the function, it proccess the expression within the bracket as a reference and when you call it as a value.
I'm not 100% sure about that, but I think that's how it works.
best tutorial
Do you have Class || OOP? thx ;)
+Eos April Not yet but will get into it in the future
+mmtuts Ok Boss ;) Until then, my eyes are on you || i loop your tutorials until i became a master on PHP ;) ja ja ja, sweet dreams...
In your first line of code you put a variable $x in the parentheses. $x is present outside and so is $a so why not put $a in there instead of $x? And it would be easier to uN if the parentheses remained empty
I don't quite understand about which variables go in the parentheses and what is meant "to call" a variable exactly
if you put for example a $x in parantheses means that your function need to get a value from user
For example :
function myFunc($x) {
if ($x % 2 == 0){
echo 'the number is even';
}
else {
echo 'the number is odd';
}
}
//now you give a value to your function
myFunc(20);
//here you can put any number and it goes instead of x in function
//now if you check your browser it shoud tell that the number is even
//if you put 5 it tells that the number is odd
i hope you got that
Someone please explain: the function newcalc deals with $x and in said code $newnr is multiplying $x by 0.75 for its value. So. How can calling newCalc($a) actives the function? When $newnr is using the value of $x???
yeah well youd have to rename the $x or add another function $a to actually trigger the function
Cant you just do newCalc($x,$a), instead of having returning it twice?
Parse error: syntax error, unexpected 'newcalc' (T_STRING)
Isn't there any update??? this is like 5yrs ago
You're conflating variables and parameters. You could just as easily omit the global variable $x and just pass the parameter as a number in the function call that will be used by reference.
I'd highly avoid this type of name collision as it's really hard to follow the code flow.
The function isn't 'looking' for a variable anywhere other than as the parameter in the function's invocation. function(2) for instance. It just assigns 2 to $x and then runs the function.
You're passing the value of $x by reference to the invocation, which is then (confusingly) assigning it to a local variable of the same name.
You can test it by changing the variable name to $n in the global scope and the function parameter and it will still work as intended.
👍
Yes I'm quite aware hehe 😊 If I'm not mistaken, I explain that at some point near the end. (or I'm remembering wrong and I do that in my JS course)
@@Dani_Krossing a minor quibble, of course.
Good content. You have a knack for it. 😎👍
You're explanations are a bit too fast, but still helpful.
they are OOPS concepts.
It's confusing when you use $x both as variable and as parameter... Personally I use different names to prevent my brain to cook
I tried this!
you can also do this:
Very Smart!!! Congratulations
hi
You didn't mention the use of return inside a function, and the possibility of inputing different parameters separated by a comma.
Thats something pretty basic.