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  1. <?php
  2.  
  3. // your code goes here
  4.  
  5. $x = '';
  6. $y = $x ?? null;
  7. $z = $x ?: null;
  8.  
  9. var_dump($y, $z);
Success #stdin #stdout 0.04s 25596KB
comments (?)
stdin 
Standard input is empty
stdout 
string(0) ""
NULL
https://ideone.com/UsEmmU
language:
PHP (php 7.3.5)
created:
5 hours ago
visibility:
public

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