PHP Magic Tricks - Speaker Deck

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PHP Magic Tricks Symfony User Group Berlin

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DISCLAIMER

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TRY THIS AT HOME

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DON‘T DO THIS TO YOUR PROJECT

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Trick #1 Twisted truth

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// Insert Magic Code Here var_dump(true === false); Code bool(true) Output Trick #1 Twisted truth

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Trick #2 Sum Sum Sum

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// 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

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int(3) int(0) int(3) int(9) Output Trick #2 Sum Sum Sum

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Trick #3 EvilVar

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// Insert Magic Code Here (4 lines) eval($$$$var); Code Hello World Output Trick #3 EvilVar

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Trick #4 Weird assignment

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Trick #4 Weird assignment // Insert Magic Code Here (10 lines) $var = 'Hello!'; echo $var; Code World! Output

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Trick #5 Count on me

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Trick #5 Count on me // Insert Magic Code Here for ($i = 0; $i <= count($data); $i++){ $data++; } echo $data; Code Hello Output

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Trick #6 PHP in the middle

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Trick #6 PHP in the middle // Insert Magic Code Here (6 lines) echo 'Hello'; echo 'World'; Code Hello PHP World Output

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Trick #7 Mad World

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Trick #7 Mad World // Insert Magic Code Here (3 lines) echo 'Foobar'; echo PHP_EOL; echo 'Hello World'; Code dlroW olleH rabooF Output

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RULES

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• replace „Insert Magic Code Here“ comments • no script termination return, exit, die, __halt_compiler, etc… • all lines executed on runtime • no additional eval RULES

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• Fork github.com/chr-hertel/php-magic-tricks • Your solutions as pull request • My solutions later tonight RULES