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What does this ~ operator mean here?
Bit not operation in PHP(or any other language probably)
Can someone explain me the ~ operator in PHP? I know it's a NOT-operator, but why does PHP convert following statement to the negative value of the variable minus one?
$a = 1; echo ~$a // echo -2 $a = 2; echo ~$a // echo -3 $a = 3; echo ~$a // echo -4 
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The bitwise NOT operator in C++ is the tilde character ~ . Unlike & and |, the bitwise NOT operator is applied to a single operand to its right. Bitwise NOT changes each bit to its opposite: 0 becomes 1, and 1 becomes 0.
The “double tilde” (~~) operator is a double NOT Bitwise operator. Use it as a substitute for Math. floor(), since it's faster.
In C the tilde character is used as bitwise NOT unary operator, following the notation in logic (an ! causes a logical NOT, instead). This is also used by most languages based on or influenced by C, such as C++, D and C#.
This is a special kind of operator in JavaScript. To understand the double tilde operator, first, we need to discuss the tilde operator or Bitwise NOT. The (~) tilde operator takes any number and inverts the binary digits, for example, if the number is (100111) after inversion it would be (011000).
This is called the two's complement arithmetic. You can read about it in more detail here.
The operator ~ is a binary negation operator (as opposed to boolean negation), and being that, it inverses all the bits of its operand. The result is a negative number in two's complement arithmetic.
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It's a bitwise NOT.
It converts all 1s to 0s, and all 0s to 1s. So 1 becomes -2 (0b111111111110 in binary representation).
Have a look at the doc http://php.net/manual/en/language.operators.bitwise.php
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