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Consider:
echo 50 >> 4;
Output:
3
Why does it output 3?
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It is the bitwise shift operator. Specifically, the left-shift operator. It takes the left-hand argument and shifts the binary representation to the left by the number of bits specified by the right-hand argument, for example: 1 << 2 = 4.
The right shift operator ( >> ) returns the signed number represented by the result of performing a sign-extending shift of the binary representation of the first operand (evaluated as a two's complement bit string) to the right by the number of bits, modulo 32, specified in the second operand.
>> Indicates the bits are to be shifted to the right. Each operand must have an integral or enumeration type. The compiler performs integral promotions on the operands, and then the right operand is converted to type int .
Bitwise Right shift operator >> is used to shift the binary sequence to right side by specified position.
50 in binary is 11 0010, shift right by 4 yields 11 which is equal to 3.
See PHP documentation and Wikipedia.
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