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run code in 300+ PHP versions simultaneously

@ 2013-11-14T11:07:26Z

<?php
function benchmarkMemory(callable $function, $args=null)
{
   declare(ticks=1);
   if(!class_exists('classWithNoName'))
   {
      class classWithNoName
      {
         public static $memory, $max;
      }
      
      function functionWithNoName()
      {
         classWithNoName::$memory = memory_get_usage() - classWithNoName::$memory;
         classWithNoName::$max    = classWithNoName::$memory>classWithNoName::$max?
                                    classWithNoName::$memory:
                                    classWithNoName::$max;
         classWithNoName::$memory = memory_get_usage();
      }
      classWithNoName::$memory = memory_get_usage();
      classWithNoName::$max    = 0;  
   }
   register_tick_function('functionWithNoName');
   $result = is_array($args)?
             call_user_func_array($function, $args):
             call_user_func_array($function);
   unregister_tick_function('functionWithNoName');
   $memory = classWithNoName::$max;
   classWithNoName::$max = 0;
   return [
      'memory' => $memory
   ];
}

var_dump(benchmarkMemory('str_repeat', ['test',1E4]));//40068
var_dump(benchmarkMemory('str_repeat', ['test',1E3]));//4040

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.25, 7.3.0 - 7.3.12, 7.4.0: array(1) { ["memory"]=> int(40960) } array(1) { ["memory"]=> int(4096) }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38: array(1) { ["memory"]=> int(40120) } array(1) { ["memory"]=> int(4072) }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/bQqGA on line 30
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/bQqGA on line 30
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/bQqGA on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting ')' in /in/bQqGA on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/bQqGA on line 2
Process exited with code 255.

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