PHP two-dimensional array rectangular transposition example sharing

This article mainly introduces examples of PHP two-dimensional array rectangular transposition. Interested friends can refer to it. I hope it will be helpful to everyone.

PHP two-dimensional array rectangular transposition example

<?php
  
  //二维数组转置
  //定义一个二维数组

  $arr =array(array(1,2,3),array(4,5,6));

  //定义一个数组来放置转置的数据
  $arr1=array();

  //转置前遍历
  echo "转置前:<br/>";
  for($i=0;$i<count($arr);$i++){
    
    for($j=0;$j<count($arr[$i]);$j++){
    
      echo $arr[$i][$j];
      
    }
    echo "<br/>";
  }

  echo "转置前后:<br/>";
  //确定装置后的行数
  for($j=0;$j<count($arr[0]);$j++){
    $arr1[$j]=array();
  }
  for($i=0;$i<count($arr);$i++){
    
    for($j=0;$j<count($arr[$i]);$j++){
    
      $arr1[$j][$i]= $arr[$i][$j];
      //echo $arr;
    }
  }

  //转置后遍历:
  for($k=0;$k<count($arr1);$k++){
    
    for($l=0;$l<count($arr1[$k]);$l++){
    
      echo $arr1[$k][$l];
    }
    echo "<br/>";
  }
?>

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