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run code in 300+ PHP versions simultaneously

@ 2016-01-11T17:19:58Z

<?php
function setKey($session_keys, $value)
	{
		$current_key = '';
		$counter = 0;
		$prev_step = $_SESSION;

		try {
			$session_keys_array = explode(':', $session_keys);
			
           krsort($session_keys_array);
            $c = count($session_keys_array);
            $count = 0;
            $arr = array();
			foreach ($session_keys_array as $key) {
		        $count++;
		        
    		    switch ($count) {
                    case 1:
                        $arr[$key] = $value;
                        break;
                    case ($count > 1 AND $count < $c):
                       $arr[$key] = $arr;
                        break;
                    case $c:
                        $_SESSION[$key] = $arr;
                        break;
                }
			
			}
		} catch (Exception $e) {
			//TODO:log notice if Session[currentKey] is not an array
			return false;
		}
        	
		return array_key_exists($key,$prev_step) && eval('!empty($_SESSION' . $current_key . ');');
	}
    
$_SESSION['1']['2']['3'] = 'zzzz';

setKey('1:2:3', 77);

echo $_SESSION['1']['2']['3'];
print_f($_SESSION);

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 77 Fatal error: Uncaught Error: Call to undefined function print_f() in /in/srZoI:44 Stack trace: #0 {main} thrown in /in/srZoI on line 44
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40: 77 Fatal error: Call to undefined function print_f() in /in/srZoI on line 44
Process exited with code 255.

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