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  1. <?php
  2. $x = function ($a) {
  3.   return $a * 2;
  4. };
  5.  
  6. echo assert( 
  7.   true === is_callable($x) 
  8. );
  9.  
  10. echo "\n";
  11.  
  12. echo assert( 
  13.   4 == $x(2) 
  14. );
Success #stdin #stdout 0.01s 83008KB
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https://ideone.com/DvFJM2
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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