Example of mutual conversion between one-dimensional arrays and two-dimensional arrays in PHP

The previous two articles, "PHP one-dimensional array" and "PHP two-dimensional array", detail one-dimensional arrays and two-dimensional arrays. in this chapter, I will introduce the mutual conversion between one-dimensional arrays and two-dimensional arrays! The previous two articles, "What is a one-dimensional php array, a one-dimensional php array instance explanation" and "What is a two-dimensional php array, php two-dimensional array example describes in detail the one-dimensional array and two-dimensional array, this chapter I will introduce the implementation of mutual conversion between one-dimensional array and two-dimensional array!

Let's not talk about it. First, we will introduce the sample code for converting a one-dimensional array into a two-dimensional array:

The output result is:

Array ([0] => Array ([0] => a[1] => b[2] => c[3] => d )[1] => Array ([0] => a[1] => b[2] => c[3] => d )[2] => Array ([0] => a[1] => b[2] => c[3] => d ))

Two ways to convert a two-dimensional array into a one-dimensional array:

How to convert the following two-dimensional array into one-dimensional array.

 '45',    'name'=>'jack'  ),  array(    'id'=>'34',    'name'=>'mary'  ),  array(    'id'=>'78',    'name'=>'lili'  ),);?>

Method 1:

foreach($msg as $k => $v){        $ids[] = $id;        $names[] = $name;      }

Method 2:

$ids = array_column($msg, 'id');$names = array_column($msg, 'name');

The result of the preceding two solutions: print_r ($ names:

Array(　　[0]=>jack　　[1]=>mary　　[2]=>lili)

Note: array_column (); there can be a third parameter, such as $ n = array_column ($ msg, 'name', 'id ');

The result of print_r ($ n); is:

Array(　　[45]=>jack　　[34]=>mary　　[78]=>lili)

[Recommended tutorials]

1. related topic recommendations: php Array (Array)

2. related video course recommendations: sort multiple arrays at the same time. multi-dimensional arrays are converted into one-dimensional arrays by values: array_multisort ()

The above is a detailed example of mutual conversion between one-dimensional arrays and two-dimensional arrays in PHP. For more information, see other related articles in the first PHP community!