How to implement matrix transpose of two-dimensional array in php

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][$j];//转置前遍历数组。
}
echo &#39;<br/>&#39;;
}
//下面来对数组进行转置
//遍历转置后的数组
for($k=0;$k<count($arr1);$k++){
for($n=0;$n<count($arr1[$k]);$n++){
echo $arr1[$k][$n];
}
echo &#39;<br/>&#39;;
}
?>

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