How to implement matrix in php code

The method of implementing the matrix in php code: first take out the number of rows and columns; then control the number of turns in the outer loop; then pass "j=i;j

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

[PHP] Algorithm - Print clockwise PHP implementation of matrix

1. Take out the number of rows and columns, row, col, and the number of circles are (smaller value -1)/2 1

2. Outer loop Control the number of circles, the inner four for loops, i

3. The first for loop, from left to right, j=i;j

4. The second for loop, from top to bottom, k=i 1;k

5. The third loop, from right to left, m=col-2-i;m>=i&&row-1-i!=i;m-- arr[row-1-i][m]// When row-1-i!=i is a single row, it is only printed once

6. The fourth loop, from bottom to top, n=row-2-i;n>=i&&col-1-i!= i;n-- arr[n][i]

$col ? $col : $row)-1)/2+1); for($i=0;$i<$circle;$i++){ //转圈开始 //从左到右 for($j=$i;$j<=$col-1;$j++){ $t=$arr[$i][$j]; if(in_array($t,$res)) continue; $res[]=$t; } //从上到下 for($k=$i+1;$k<$row-$i;$k++){ $t=$arr[$k][$col-$i-1]; if(in_array($t,$res)) continue; $res[]=$t; } //从右到左 for($m=$col-$i-2;$m>=$i;$m--){ $t=$arr[$row-$i-1][$m]; if(in_array($t,$res)) continue; $res[]=$t; } //从下到上 for($n=$row-$i-2;$n>$i;$n--){ $t=$arr[$n][$i]; if(in_array($t,$res)) continue; $res[]=$t; } } return $res; } $res=printMatrix($arr);

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