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edited Apr 13, 2017 at 12:39

Know your Trues and Falses

Each language sees "true" and "false" in a slightly different way. If they have similar syntax, you can exploit this by adding a decision that the languages will handle differently.

One example One example from the Trick or Treat thread uses '', an empty string. In Lua, this evaluates to truthy, but falsy in Python, so the following:

print(''and'trick'or'treat')

..will print a different string in each language.

All it takes is finding a value like this. For example, you could use '0', which evaluates to false in PHP but true in Python.

Know your Trues and Falses

Each language sees "true" and "false" in a slightly different way. If they have similar syntax, you can exploit this by adding a decision that the languages will handle differently.

One example from the Trick or Treat thread uses '', an empty string. In Lua, this evaluates to truthy, but falsy in Python, so the following:

print(''and'trick'or'treat')

..will print a different string in each language.

All it takes is finding a value like this. For example, you could use '0', which evaluates to false in PHP but true in Python.

Know your Trues and Falses

Each language sees "true" and "false" in a slightly different way. If they have similar syntax, you can exploit this by adding a decision that the languages will handle differently.

One example from the Trick or Treat thread uses '', an empty string. In Lua, this evaluates to truthy, but falsy in Python, so the following:

print(''and'trick'or'treat')

..will print a different string in each language.

All it takes is finding a value like this. For example, you could use '0', which evaluates to false in PHP but true in Python.

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answered Nov 26, 2016 at 10:34

FlipTack

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Know your Trues and Falses

Each language sees "true" and "false" in a slightly different way. If they have similar syntax, you can exploit this by adding a decision that the languages will handle differently.

One example from the Trick or Treat thread uses '', an empty string. In Lua, this evaluates to truthy, but falsy in Python, so the following:

print(''and'trick'or'treat')

..will print a different string in each language.

All it takes is finding a value like this. For example, you could use '0', which evaluates to false in PHP but true in Python.