PHP Functions | Functions in PHP - PHP Tutorial 59

Notes for You:: PHP Functions.
- A function is a block of code with name, meant to perform a specific task.
- Whenever we want to perform a specific task, we create a function.

Creating a function:
- A function is created or defined with the help of function keyword.

Syntax: /* function definition */
function functionName( [param1,param2, …. paramN] )
{
statement(s) to be executed;

[return returningValue;]
}

Example:
- A function without parameters, without returning value.
function wishHi()
{
echo "Hi", "<br/>";
}

Note: Functions get execute only when we call them.

Syntax: /* function call */
functionName( [ param1, param2 …. paramN ] );

Example:
wishHi(); // Hi

Note: Why Functions? Functions are created
- for manageability (i.e. to divide a larger problem into smaller tasks or modules)
- for reusability (i.e. once a function is defined, it can be used multiple times)
- for abstraction (i.e. hiding the way how tasks are done) (creating libraries)

Example:
wishHi(); // Hi
wishHi(); // Hi
wishHi(); // Hi

Note: By default a function returns null in PHP.
var_dump(wish()); // null


Note:
- replace < with less-than symbol.
- replace > with greater-than symbol.

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PHP Tutorial 60 - Types of Functions in PHP | PHP Types of Functions
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PHP Tutorial 58 - Program to print Pyramid pattern of Stars and Numbers in PHP
https://youtu.be/ghHxzP344-g

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