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  1. <?php
  2.  
  3. $a = array();
  4.  
  5. $a[null] = 'foo';
  6.  
  7. var_dump($a);
Success #stdin #stdout 0.01s 20520KB
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Standard input is empty
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array(1) {
  [""]=>
  string(3) "foo"
}
https://ideone.com/pXRVKE
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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