顺时针方向打印矩阵
http://blog.csdn.net/wusuopubupt/article/details/12788249
在这里看到的。
<?php<br>
/**<br>
* @author:wusuopubupt<br>
* @date:2013-10-16<br>
* @from:http://ac.jobdu.com/problem.php?pid=1391<br>
* <br>
* Print matrix in clockwise<br>
* */<br>
$matrix = array<br>
(<br>
array(1,2,3,4),<br>
array(5,6,7,8),<br>
array(9,10,11,12),<br>
array(13,14,15,16),<br>
array(17,18,19,20)<br>
);<br>
<br>
print_matrix($matrix);<br>
<br>
function print_matrix($arr) {<br>
$top = 0;<br>
$left = 0;<br>
$right = count($arr[0])-1;<br>
$bottom = count($arr)-1;<br>
<br>
while ($left != $right && $top != $bottom) {<br>
//top<br>
for($j = $left; $j <= $right; $j++) {<br>
echo $arr[$top][$j]." ";<br>
}<br>
$top++;<br>
<br>
//right<br>
for($i = $top; $i <= $bottom; $i++) {<br>
echo $arr[$i][$right]." ";<br>
}<br>
$right--;<br>
<br>
//bottom<br>
for($j = $right; $j >= $left; $j--) {<br>
echo $arr[$bottom][$j]." ";<br>
}<br>
$bottom--;<br>
<br>
//left<br>
for($i = $bottom; $i >= $top; $i--) {<br>
echo $arr[$i][$left]." ";<br>
}<br>
$left++;<br>
}<br>
}为啥输出结果是这样的呢？1 2 3 4 8 12 16 20 19 18 17 13 9 5 6 7 11 15 14 10
