在PHP中创建一个空的2D数组？ [英] Creating an empty 2D array in PHP?

问题描述

我知道数组是动态创建的，而且提前创建数组并不是必需的，但是如何用2D数组呢？同样的方式？

 （$ j）
 {
（$ i）
 {
 $ array [j] [i] =data; 
} 
} 
  

这样的东西？

解决方案

在其绝对最简单的情况下，2D维数组可以创建为：

 <？php 
 $ emptyArray = array（array（））; 
？> 
  

或者从PHP 5.4开始，您还可以使用：

 <？php 
 $ emptyArray = [[]]; 
？> 
  

I know that arrays are created dynamically, and creating them ahead of time isn't really necessary, but how would one do that with a 2D array? The same way?

(for$j)
{
for($i)
    {
    $array[j][i] = "data";
    }
}

Something like that? Obviously real for loops, of course.

解决方案

At its absolute simplest, a 2D dimensional array can be created as:

<?php
    $emptyArray = array(array());
?>

Or as of PHP 5.4 you can also use:

<?php
    $emptyArray = [[]];
?>

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