Method Example of Clockwise Printing Matrix of Spiral Matrix by PHP

In this paper, an example is given to describe the method of clockwise printing matrix by PHP. Share it for your reference, as follows:

Problem

Enter a matrix and print out every 1 number in clockwise order from outside to inside, for example, if you enter the following matrix:

1	2	3	4
5	6	7	8
9	10	11	12
13	14	15	16

The numbers 1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10 are printed in turn.

Solution

Is to print 1 circle 1 circle, as long as you control the cycle.
Pay attention to the situation of single row and single column.

Implementation code

<?php
function printMatrix($matrix)
{
 $row = count($matrix);
 $col = count($matrix[0]);
 if($row == 0 || $col == 0)
  return $matrix;
 $result = array();
 $left = 0;$right = $col-1; $top = 0;$bottom = $row-1;
 while($left<=$right && $top<= $bottom){
  for($i =$left;$i<=$right;++$i){
   array_push($result, $matrix[$top][$i]);
  }
  for($i =$top+1;$i<=$bottom;++$i)
   array_push($result, $matrix[$i][$right]);
  if($top!=$bottom){
   for($i = $right-1;$i>=$left;--$i)
    array_push($result, $matrix[$bottom][$i]);
  }
  if($left!=$right){
   for($i = $bottom-1;$i>$top;--$i)
    array_push($result, $matrix[$i][$left]);
  }
  $left++;$right--;$top++;$bottom--;
 }
 return $result;
}

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