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DifferentWaysToCountTo10.php
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DifferentWaysToCountTo10.php
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<?php
/*
Demonstrate several different ways to count to 10
Results:
Count to 10 using an incrementing for loop:
0 1 2 3 4 5 6 7 8 9 10
Count to 10 using a constant value and a decrementing for loop:
0 1 2 3 4 5 6 7 8 9 10
Count to 10 using a foreach and a range array:
0 1 2 3 4 5 6 7 8 9 10
Count to 10 using a while loop:
0 1 2 3 4 5 6 7 8 9 10
Count to 10 using a do while loop:
0 1 2 3 4 5 6 7 8 9 10
Count to 10 using a class and a recursive method and a referenced variable:
0 1 2 3 4 5 6 7 8 9 10
*/
$output = 'Count to 10 using an incrementing for loop: ' . PHP_EOL;
for($i = 0; $i <= 10; $i++){
$output .= "$i ";
}
echo $output . PHP_EOL . PHP_EOL; // 0 1 2 3 4 5 6 7 8 9 10
$output = 'Count to 10 using a constant value and a decrementing for loop: '. PHP_EOL;
const n = 10;
for($i = 10; $i >= 0; $i--){
$output .= n - $i . ' ';
}
echo $output . PHP_EOL . PHP_EOL; // 0 1 2 3 4 5 6 7 8 9 10
$output = 'Count to 10 using a foreach and a range array: ' . PHP_EOL;
foreach(range(0, 10, 1) as $i){
$output .= "$i ";
}
echo $output . PHP_EOL . PHP_EOL; // 0 1 2 3 4 5 6 7 8 9 10
$output = 'Count to 10 using a while loop: ' . PHP_EOL;
$i = 0;
while($i <= 10){
$output .= $i++ . ' ';
}
echo $output . PHP_EOL . PHP_EOL; // 0 1 2 3 4 5 6 7 8 9 10
$output = 'Count to 10 using a do while loop: ' . PHP_EOL;
$i = 0;
do{
$output .= $i++ . ' ';
}while($i <= 10);
echo $output . PHP_EOL . PHP_EOL; // 0 1 2 3 4 5 6 7 8 9 10
// unset and garbage collect output
$output = NULL;
unset($output);
class RecursiveCounter{
private $current_count = 0;
private $start = 0;
private $stop = 0;
private $result = '';
function __construct($start = 0, $stop = 0, &$results){
if(!is_numeric($this->start) || !is_numeric($this->stop)){
die('Invalid count range' . PHP_EOL);
}
$this->start = $start;
$this->current_count = $this->start;
$this->stop = $stop;
$this->RecursiveCount();
$results = $this->result;
}
private function RecursiveCount(){
$this->result .= $this->current_count . ' ';
$recurse = false;
if($this->start < $this->stop &&
$this->current_count <= $this->stop){
$this->current_count++;
if($this->start < $this->stop &&
$this->current_count <= $this->stop){
$recurse = true;
}
}elseif($this->start > $this->stop &&
$this->current_count >= $this->stop){
$this->current_count--;
if($this->start > $this->stop &&
$this->current_count >= $this->stop){
$recurse = true;
}
}
if($recurse){
// Recurse
$this->RecursiveCount();
}
}
}
echo 'Count to 10 using a class and a recursive method and a referenced variable: ' . PHP_EOL;
$counter = new RecursiveCounter(0, 10, $output); // $output is empty and is the referenced variable
echo $output . PHP_EOL . PHP_EOL; // 0 1 2 3 4 5 6 7 8 9 10