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<?php
 
$a = [0 => array(),  1=> array()];
 
 
 
$a[0] = "cat";
$a[0] = "dog";
$a[1][] = "koala";
$a[1][] = "horse";
 
var_dump($a);

Success #stdin #stdout 0.01s 82880KB

stdin

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Standard input is empty

stdout

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array(2) {
  [0]=>
  string(3) "dog"
  [1]=>
  array(2) {
    [0]=>
    string(5) "koala"
    [1]=>
    string(5) "horse"
  }
}

https://ideone.com/xktF87

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PHP (php 7.3.5)

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