PHP Functions !!
In this article we will discuss about PHP functions in brief.
PHP Functions
A function is a block of some code which is designed to perform particular task.
Why Functions ?
- Increase the readability
- For code re-usability
- less code
Types Of Functions
1) Predefined Functions
2) User defined Functions
1) Predefined Functions
Predefined functions are functions which is php provide us.
It is already defined.
Let's see some predefined functions
echo : echo is used for print the message.
which is defined already in php.
PHP interpreters knows how predefined functions works.
Program :
Output :
Predefined Functions
User defined Functions
User defined functions are made by user according to requirements.
It reduce the code lines.
It uses when we have to use same code many times in a program.
We create a function once and use whenever needed.
Syntax :
function name_userfunction( )
{
code of block
}
Where, function is keyword for create a function.
name_userfunction is name of your function you can write any thing here.
Program :
Output :
Hello !! function is created
Here, we created hello() function and print message in the function.
After that for call the function we just need to write function name like here we call function by write hello().
It is not necessary to call function in same block where you declare the function.
Function can call anywhere in the program where we needed.
Function With Argument
We can pass argument in the function parameter.
It is used for give value at run time.
We pass string or integer or any kind of data which we want to print.
Syntax :
function name_userfunction(arguments)
{
code of block
}
Program :
Output :
Hello !! Welcome NibKarma
Here we take and argument $name and at declaration time we pass the string "NibKarma".
We can also use a variable as a argument in function call.
This argument pass value to the parameter of function.
Program :
Output :
nibkarma
Here we store a string in variable $a and pass in the function argument which is replace by $ name and prints the nibkarma.
In this article we discuss about functions both predefined and user defined in brief.
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