How to create a two-dimensional array in php without assigning values

php can use an empty array to create a two-dimensional array without assigning values. The code is "$twoDimensionalArray = array()". You can use the array index in subsequent codes to assign values ​​to the two-dimensional array.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

In PHP, you can use an empty array to initialize a two-dimensional array, and then assign values ​​as needed. The following is a sample code:

$twoDimensionalArray = array();

You can use the array index to assign values ​​to the two-dimensional array in subsequent code, for example:

$twoDimensionalArray[00] = 1;
$twoDimensionalArray[0][1] = 2;
$twoDimensionalArray[1][0] = 3;
$twoDimensionalArray[1][1] = 4;

At this time, $twoDimensionalArray will It will be a 2x2 two-dimensional array with the following content:

array (
  0 => 
  array (
    0 => 1,
    1 => 2,
  ),
  1 => 
  array (
    0 => 3,
    1 => 4,
  ),
)

The assignment operation can be performed according to actual needs.

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