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 />
}
