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  1. <?php
  2.  
  3. var_dump(isset($noSuchVariable)); // false
  4.  
  5. $nullVariable = null;
  6. var_dump(isset($nullVariable)); // also false
  7.  
  8. var_dump(!!compact('noSuchVariable')); // false
  9.  
  10. var_dump(!!compact('nullVariable')); // true
Success #stdin #stdout 0.02s 13064KB
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bool(false)
bool(false)
bool(false)
bool(true)
https://ideone.com/fGqjhm
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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