How to Create Your Own Function in PHP | PHP Tutorial | Learn PHP Programming | PHP Lesson. A function is used in PHP to run a script that has a specific purpose in your code. Today we will learn about functions and how to use them in our websites.
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*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: https://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: https://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.
echo “75% of $x is $newnr”; Use dubel quotes then you dont need the , or .
you can also do this:
< ?php function newCalc($x) { $newnr = $x * 0.75; echo "Here is 75% of what you wrote: ".$newnr; } $x = 100; $y = 1000; if ($y == 1000) { newCalc($x); } ?>
Hi, Daniel. Your PHP tutorial is one of the best I have watched. Thank you. Just curious, where you from?
Do you have Class || OOP? thx 😉
Echoing rathering than returning a value is known as a side-effect of a function which generally goes against your original point.
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
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.
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?
When you finish the beginer tutorials try sell the next tutorials advanced, i will definitely buy, your tutorials are the best.
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.