顺时针方向打印矩阵

题目：http://ac.jobdu.com/problem.php?pid=1391

php实现：

<?php/** * @author:wusuopubupt * @date:2013-10-16 * @from:http://ac.jobdu.com/problem.php?pid=1391 *  * Print matrix in clockwise * */$matrix = array(array(1,2,3,4),array(5,6,7,8),array(9,10,11,12),array(13,14,15,16),array(17,18,19,20));print_matrix($matrix);function print_matrix($arr) {$top = 0;$left = 0;$right = count($arr[0])-1;$bottom  = count($arr)-1;while ($left != $right && $top != $bottom) {//topfor($j = $left; $j <= $right; $j++) {echo $arr[$top][$j]." ";}$top++;//rightfor($i = $top; $i <= $bottom; $i++) {echo $arr[$i][$right]." ";}$right--;//bottomfor($j = $right; $j >= $left; $j--) {echo $arr[$bottom][$j]." ";}$bottom--;//leftfor($i = $bottom; $i >= $top; $i--) {echo $arr[$i][$left]." ";}$left++;}}

打印输出：