what is built in function in php ? and whts the difference of it with user defined functions? i think isset, unset, gettype,settype, strlen, strpos etc are built in function and when we write a function like this > function name{} that is user defined ? im little bit confused about this, please help me boss.
bulbul.sust.9
0
Newbie Poster
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Jump to PostYep, things like isset is an inbuilt function that can be called at any time. A user defined function is something that MUST be set manually like this:
<?php function MyName() { echo 'My Name is AHarrisGsy'; } ?>You would then call it like this:
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Octet
45
Newbie Poster
Featured Poster
Yep, things like isset is an inbuilt function that can be called at any time. A user defined function is something that MUST be set manually like this:
<?php
function MyName()
{
echo 'My Name is AHarrisGsy';
}
?>
You would then call it like this:
MyName();
Which should (providing it is done correctly), echo the words: "My Name is AHarrisGsy"
Good luck, I hope this helps and happy coding!
LastMitch
@bulbul.sust.9
You can read this to understand each function:
http://www.php.net/manual/en/langref.php
or this
http://www.tutorialspoint.com/php/php_function_reference.htm
You will find that there is many example on how to used those functions.
I hope this will help!
diafol
As a rule functions will return a value. It is up to the calling code what to do with that value.
e.g.
function welcome($name){
return "my name is $name";
}
echo welcome('diafol'); //prints: my name is diafol
$sentence = welcome('diawl');
echo "I live in Hell and $sentence"; //prints: I live in Hell and my name is diawl
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