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  1. <?php
  2. $a = "test";
  3. echo "${$a ?? 'test'}";
Success #stdin #stdout #stderr 0.02s 24312KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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PHP Notice:  Undefined variable: test in /home/6s2EKX/prog.php on line 3
https://ideone.com/eFOLjp
language:
PHP (php 7.3.5)
created:
4 years ago
visibility:
public

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