1: <?php
 2: 
 3: namespace Demo;
 4: 
 5: class NativeEval
 6: {
 7:     public $input;
 8:     public $result;
 9: 
10:     public function __construct($input)
11:     {
12:         $semicolonsCount = substr_count($input, ';');
13:         if ($input === '') {
14:             $this->input = 'return 0;';
15:         } elseif ($semicolonsCount == 0) {
16:             $this->input = "return {$input};";
17:         } elseif ($semicolonsCount == 1) {
18:             $this->input = "return {$input}";
19:         } else {
20:             $lastSemicolon = strrpos($input, ';', -2) + 1;
21:             $before = substr($input, 0, $lastSemicolon);
22:             $after = substr($input, $lastSemicolon);
23:             $this->input = "{$before} return $after";
24:         }
25:     }
26: 
27:     public function __invoke()
28:     {
29:         $result = @eval($this->input);
30:         $this->result = $result !== false && $result !== null ? $result : 'Invalid PHP code';
31:     }
32: }
33: