PHP's in_array unexpected result

Question

When I execute this small piece of PHP code:

php -r \"echo(in_array(0, array(\'aaa\', \'bbb\')));\"

That echoes true...

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Answer 1

That's because for PHP this code will return true

0 == 'aaa'

So without strict checking PHP will find your value in given array.

Answer 2

Also, check out this code:

   var_dump(0 == 'aaa');
   var_dump(0 === 'aaa');
   var_dump(in_array(0, array('aaa', 'bbb')));
   var_dump(in_array(0, array('aaa', 'bbb'), true));

The last version allows strict type comparison so it will work as expected, that is return false.