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echo ~4; // outputs **-5**
echo ~4; // outputs
-5
The NOT operator uses two's complement.
http://langconv.com/lc/lctopic/twos_compl.php
http://www.php.net/manual/en/language.operators.bitwise.php
http://langconv.com/lc/lctopic/twos_compl.php
http://www.php.net/manual/en/language.operators.bitwise.php
PHP,NOT,~
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