PHP Magic Tricks

As a part of our joint #xmasmeetup we played a game called PHP Magic Tricks. Solutions were submitted on github.com/chr-hertel/php-magic-tricks.

Transcript

1. PHP Magic Tricks Symfony User Group Berlin
2. DISCLAIMER
3. TRY THIS AT HOME
4. DON‘T DO THIS TO YOUR PROJECT
5. Trick #1 Twisted truth
6. // Insert Magic Code Here var_dump(true === false); Code bool(true) Output Trick #1 Twisted truth
7. Trick #2 Sum Sum Sum
8. // Insert Magic Code Here var_dump(count($array), array_sum($array)); $array[0] = 1; $array[1] = 2; $array[2] = 3; var_dump(count($array), array_sum($array)); Code Trick #2 Sum Sum Sum
9. int(3) int(0) int(3) int(9) Output Trick #2 Sum Sum Sum
10. Trick #3 EvilVar
11. // Insert Magic Code Here (4 lines) eval($$$$var); Code Hello World Output Trick #3 EvilVar
12. Trick #4 Weird assignment
13. Trick #4 Weird assignment // Insert Magic Code Here (10 lines) $var = 'Hello!'; echo $var; Code World! Output
14. Trick #5 Count on me
15. Trick #5 Count on me // Insert Magic Code Here for ($i = 0; $i <= count($data); $i++){ $data++; } echo $data; Code Hello Output
16. Trick #6 PHP in the middle
17. Trick #6 PHP in the middle // Insert Magic Code Here (6 lines) echo 'Hello'; echo 'World'; Code Hello PHP World Output
18. Trick #7 Mad World
19. Trick #7 Mad World // Insert Magic Code Here (3 lines) echo 'Foobar'; echo PHP_EOL; echo 'Hello World'; Code dlroW olleH rabooF Output
20. RULES
21. • replace „Insert Magic Code Here“ comments • no script termination return, exit, die, __halt_compiler, etc… • all lines executed on runtime • no additional eval RULES
22. • Fork github.com/chr-hertel/php-magic-tricks • Your solutions as pull request • My solutions later tonight RULES
23. CREDITS
24. all anonymous PHP devs on 3V4L.org