Practice.php

<?php

/*      //Task 1: Print Unique Numbers from an Array
$arr = [3, 2, 5, 2, 2, 2];

for($i=0; $i<6; $i++){
    $isDuplicate = false;
    for($j=0; $j<$i; $j++){
        if($arr[$i] == $arr[$j]){
            $isDuplicate = true;
        }
    }
    if(!$isDuplicate){
        echo $arr[$i]. " ";
    }
}
*/  // Ans: 3 2 5

/*    //Task 2: Print All Numbers Using Callback Function
function PrintNumbers($n, $cnt){
    if($cnt <= $n){
        echo $cnt. " ";
        $cnt++;
        PrintNumbers($n, $cnt);
    }
}

PrintNumbers(5, 1);
*/  // Ans: 1 2 3 4 5

$arr = [64, 34, 87, 12, 81, 43, 23];
$n = count($arr);

for($i=0; $i<$n-1; $i++){
    for($j=0; $j<$n-$i-1; $j++){
        if($arr[$j] > $arr[$j+1]){
            $tmp = $arr[$j];
            $arr[$j] = $arr[$j+1];
            $arr[$j+1] = $tmp;
        }
    }
}

print_r($arr);

//stp 1: 34, 64 => 0, total => 5
//stp 2: 34, 64, 87 => 1 No swap
//stp 3: 34, 64, 12, 87 => 2
//stp 4: 34, 64, 12, 81, 87 => 3
//stp 5: 34, 64, 12, 81, 43, 87 => 4
//stp 6: 34, 64, 12, 81, 43, 23, 87 => 5