# Functions
## Code Breakdown and Comments
**Purpose:** This PHP code demonstrates various programming concepts, including functions, loops, and conditional statements.
**Functions:**
- **`myfunc1()`:** A simple function that prints "Func1" to the page
- **`add2($n1, $n2)`:** Takes two numbers as input, adds them together, and returns the sum.
- **`loops()`:** A function that demonstrates different types of loops (while, do-while) and conditional statements.
**Variables:**
- **`$n1`, `$n2`:** Used in the `add2()` function to store the input numbers.
- **`$sum`:** Stores the calculated sum in the `add2()` function.
- **`$run`, `$cntr`, `$stop`, `$status`:** Variables used in the `loops()` function for loop control, counting, and status tracking.
**Loops:**
- **`while` loop:** Continues to execute as long as a given condition is true.
- **`do-while` loop:** Executes at least once, then continues as long as a given condition is true.
**Conditional Statements:**
- **`if-else` statements:** Used to make decisions based on conditions.
**Code Breakdown:**
1. **Function Definitions:**
- `myfunc1()` is defined to print a message.
- `add2()` takes two numbers, adds them, and returns the result.
- `loops()` demonstrates different loop types and conditional logic.
1. **Main Execution:**
- Calls the `myfunc1()` function.
- Calculates the sum using `add2()` and prints the result.
- Calls the `loops()` function to demonstrate loop and conditional concepts.
**Comments within `loops()`:**
- **`while` loop:** Demonstrates a basic `while` loop with a counter and a stopping condition.
- **`while` loop with `if`:** Shows how to use an `if` statement inside a loop to break out of the loop based on a condition.
- **`do-while` loop:** Demonstrates a `do-while` loop that executes at least once.
- **`if-else` statements:** Shows how to use `if-else` statements to check conditions and set a status based on the result.
```php
functions
Func1
");
}
function add2($n1,$n2)
{
$sum = $n1 + $n2;
return $sum;
}
function loops()
{
$run = TRUE;
$cntr = 1;
$stop = 11;
// Example of a while loop
while($cntr < $stop)
{
echo($cntr.". Item".$cntr."
");
$cntr +=1;
}
echo("
");
// excample of while loop using
// a boolean and if statement
$cntr = 0;
while($run)
{
echo($cntr.". Item 22 ".$cntr."
");
$cntr +=1;
if($cntr == $stop)
{
$run=FALSE;
}
}
echo("
");
// Example of do loop - always runs once
$cntr = 0;
do{
echo($cntr.". Item Do".$cntr."
");
$cntr +=1;
}while($cntr < $stop);
echo("
Status If
");
$cntr = 0;
$status = "";
$run = True;
while($run)
{
// example of else if statement
if($cntr == $stop)
{
$run=FALSE;
}
else if(($cntr % 2) == 0)
{
$status = "Even";
}
else{
$status = "Odd";
}
echo($cntr.". Item 22 ".$cntr." ".$status."
");
$cntr +=1;
}
}
?>
");
?>
Sum Example - 60 + 40
");
echo("
");
loops();
?>
```