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run code in 150+ php & hhvm versions
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<?php <?php  function factorial_of_a_number($n)  {    if($n ==0)      {         return 1;      }    else       {            return $n * factorial_of_a_number($n-1);      }      }  print_r(factorial_of_a_number(4));  ?>
based on kYofQ
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.4.31
Parse error: syntax error, unexpected '<' in /in/QcH9Q on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '<' in /in/QcH9Q on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/QcH9Q on line 2
Process exited with code 255.