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  1. <?php
  2.  
  3. //$implicit_null = 1234;
  4. $explicit_null = NULL;
  5.  
  6. var_dump(is_null($implicit_null)); // TRUE, also throws undefined index error
  7. var_dump((
  8. 	array_key_exists('implicit_null',get_defined_vars()) && 
  9. 	is_null($implicit_null)
  10. )); // FALSE
Success #stdin #stdout #stderr 0.01s 20520KB
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stdin
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Standard input is empty
stdout
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bool(true)
bool(false)
stderr
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PHP Notice:  Undefined variable: implicit_null in /home/BxEZCH/prog.php on line 6
https://ideone.com/3hyrYX
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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