in_asc_order.php

<?php
// 7 kyu- Are the numbers in order?
//
// Are the numbers in order?
// In this Kata, your function receives an array of positive integers as input. Your task is to determine whether the numbers are in ascending order.
//
// For the purposes of this Kata, you may assume that all inputs are valid (i.e. arrays containing only positive integers with a length of at least 2).
//
// For example:
//
// in_asc_order([1, 2, 4, 7, 19]); // true
// in_asc_order([1, 2, 3, 4, 5]); // true
// in_asc_order([1, 6, 10, 18, 2, 4, 20]); // false
// in_asc_order([9, 8, 7, 6, 5, 4, 3, 2, 1]); // false (NOTE: because the numbers are in DESCENDING order, not ascending order) -->


function in_asc_order($arr) {
  $arr1 = $arr;
  $x = sort($arr);
  return $x === $arr;
};

// Alternative Solution:
// function in_asc_order($arr) {
//
//   $prev = $arr[0];
//
//   foreach($arr as $key => $value) {
//    if($prev > $value) return false;
//    $prev = $value;
//   }
//
//   return true;
//
// };

$answer = in_asc_order([1,2,3]);
print_r("$answer \n");
?>