Hackerrank - 30 days of code in PHP

Day 0: Hello, World.

<?php
$_fp = fopen("php://stdin", "r");

$inputString = fgets($_fp); // get a line of input from stdin and save it to our variable

// Your first line of output goes here
print("Hello, World.\n");

// Write the second line of output

print($inputString);

fclose($_fp);
?>

Day 1: Data Types

$i2 = fgets($handle);
$d2 = fgets ($handle);
$s2 = fgets ($handle);

printf("%d\n", $i + $i2);
printf("%.1f\n", $d + $d2);
printf($s.$s2."\n");

Day 2: Operators

<?php
$_fp = fopen("php://stdin", "r");
/* Enter your code here. Read input from STDIN. Print output to STDOUT */

$mealCost = fgets($_fp);
$tipPercent = fgets($_fp) / 100 * $mealCost;
$taxPercent = fgets($_fp) / 100 * $mealCost;

$totalCost = round($mealCost + $tipPercent + $taxPercent);



echo "The total meal cost is ". $totalCost. " dollars.";
?>

Day 3: Intro to Conditional Statements

<?php

$handle = fopen ("php://stdin","r");
fscanf($handle,"%d",$N);


if(($N % 2 !==0) || (($N % 2 == 0) && ($N < 21) && (5 < $N))) {
    print "Weird";
} elseif ((($N % 2 == 0) && (1<$N) && ($N < 6)) || (($N > 20)&& ($N % 2 ==0))) {
    print "Not Weird";
}


?>

Day 4: Class vs. Instance

<?php
class Person{
    public $age;
   public function __construct($initialAge){
          // Add some more code to run some checks on initialAge
          if($initialAge < 0){
              $this -> age = 0;
              print("Age is not valid, setting age to 0.\n");
          } else {
              $this-> age = $initialAge;
          }
    }
   public  function amIOld(){
            // Do some computations in here and print out the correct statement to the console 
            if($this->age < 13){
                echo "You are young.\n";
            }elseif($this->age < 18){
                echo "You are a teenager.\n";
            } else {
                echo "You are old.\n";
            }
    }
   public  function yearPasses(){
          // Increment the age of the person in here
            $this->age++;
    }
   
      
}

Day 5: Loops

<?php

$handle = fopen ("php://stdin","r");
fscanf($handle,"%d",$N);
fgets($handle);

    for($i = 1; $i < 11; $i++){
        $result = $N * $i;
        echo "$N x $i = " . $result . "\n";
    }


?>

Day 7: Arrays

<?php

$handle = fopen ("php://stdin","r");
fscanf($handle,"%d",$n);
$arr_temp = fgets($handle);
$arr = explode(" ",$arr_temp);
array_walk($arr,'intval');

$array = array_reverse($arr, true);

foreach($array as $key=>$value){
    print_r($value." ");
}



?>