PHP method to determine whether an array is ordered, PHP determines the array_PHP tutorial

php method to determine whether an array is ordered, php determines an array

The example in this article describes the method of php to determine whether an array is ordered. Share it with everyone for your reference. The specific analysis is as follows:

The time complexity of this code is O(n)

<&#63;php 
function JudegSortArray($array) {
  if ($array [0] > $array [1]) {
    $flag = 1;
  } else {
    $flag = 0;
  }
  $temp = $flag;
  $len = count ( $array );
  for($i = 1; $i < $len; $i ++) {
    if ($flag == 0) {
      if ($array [$i] < $array [$i + 1])
      {
        continue;
      } else {
        $flag = 1;
        break;
      }
    }
    if ($flag == 1) {
      if ($array [$i] > $array [$i + 1]) {
        continue;
      } else
      {
        $flag = 0;
        break;
      }
    }
  }
  if ($flag != $temp) {
    echo "无序数组";
  } else {
    echo "有序数组";
  }
}
// 测试用例
$array = array (
    1,
    2,
    3,
    4,
    6,
    5
);
$ret = JudegSortArray ( $array );
echo $ret;

I hope this article will be helpful to everyone’s PHP programming design.

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