PHP method to realize clockwise printing matrix and spiral matrix

This article explains how to implement clockwise printing of matrices and spiral matrices in PHP.

The example in this article describes the method of printing a matrix clockwise in PHP. Share it with everyone for your reference, the details are as follows:

Question

Enter a matrix and print out each number in clockwise order from the outside to the inside. For example, if you enter the following matrix:

1234

5678

9101112

13141516

will print out the numbers 1,2,3,4,8,12 in sequence ,16,15,14,13,9,5,6,7,11,10.

The solution

is to print in circles, as long as the loop is controlled well.

Pay attention to the situation of single row and single column.

Implementation code

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;
}

This article explains how PHP implements clockwise printing of matrices and spiral matrices. For more related content, please pay attention to the PHP Chinese website.

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