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  1. <?php
  2.  
  3. const FOO = 1;
  4. $a = [FOO => 'A', 'BAR' => 'B'];
  5. echo "{$a[FOO]}, {$a[BAR]}";
Success #stdin #stdout #stderr 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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A, B
stderr
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PHP Notice:  Use of undefined constant BAR - assumed 'BAR' in /home/U66H9N/prog.php on line 5
https://ideone.com/Csv9oo
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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