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  1. <?php
  2. $v = ['a' => '1'];
  3. $a = 'a';
  4. var_dump($v["$a"]);
  5. var_dump($v['$a']);
  6.  
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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string(1) "1"
NULL
stderr
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PHP Notice:  Undefined index: $a in /home/J8o8si/prog.php on line 5
https://ideone.com/x6gUcj
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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