php method to implement matrix transposition of a two-dimensional array: first define a two-dimensional array; then determine how many rows the transposed array has; then implement row and column interchange, and traverse the array before transposing; finally Just transpose the array.
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Transpose of two-dimensional arrays and matrices in php
The transposition of a matrix, the transposition of a two-dimensional array, is a very simple little code.
<?php //定义一个二维数组 $arr=array(array(1,2,3,),array(4,5,6)); $arr1=array(); for($j=0;$j<count($arr[0]);$j++){ $arr1[$j]=array();//确定转置后的数组有几行 } for($i=0;$i<count($arr);$i++){ for($j=0;$j<count($arr[$i]);$j++){ $arr1[$j][$i]= $arr[$i][$j];//行列互换 echo $arr[$i][$j];//转置前遍历数组。 } echo '<br/>'; } //下面来对数组进行转置 //遍历转置后的数组 for($k=0;$k<count($arr1);$k++){ for($n=0;$n<count($arr1[$k]);$n++){ echo $arr1[$k][$n]; } echo '<br/>'; } ?>
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