Example to explain how to perform bitwise operations in php

With the rapid development of computer technology, bit operations have become one of the important concepts in computer science. PHP is no exception, it provides a set of functions for performing bit operations. This article will introduce in detail how PHP implements bitwise operations.

1. Bitwise AND (&) operation

The bitwise AND operation refers to performing an "AND" operation on the corresponding bit values ​​of two binary numbers, that is, only the values ​​in the corresponding bits of the two binary numbers are ANDed. When the binary bits of are all 1, the result of this bit is 1, otherwise it is 0. For example, performing a bitwise AND operation on 10100010 (162) and 01101011 (107), the result is 00100010 (34). In PHP, you can use the bitwise operator & to implement bitwise AND operations.

Sample code:

$a = 162;
$b = 107;
$c = $a & $b; //Press $a and $b Bitwise AND operation, the result is 34

2. Bitwise OR (|) operation

Bitwise OR operation refers to performing an "OR" operation on the values ​​on the corresponding bits of two binary numbers , that is, as long as one of the two corresponding binary bits is 1, the result of the bit is 1, otherwise it is 0. For example, performing a bitwise OR operation on 10100010 (162) and 01101011 (107), the result is 11101011 (235). In PHP, you can use the bitwise operator | to implement bitwise OR operations.

Sample code:

$a = 162;
$b = 107;
$c = $a | $b; //Press $a and $b Bitwise OR operation, the result is 235

3. Bitwise XOR (^) operation

The bitwise XOR operation refers to "XORing" the values ​​on the corresponding bits of two binary numbers. OR" operation, that is, if the two corresponding binary bits are different, then the result of the bit is 1, otherwise it is 0. For example, perform a bitwise XOR operation on 10100010 (162) and 01101011 (107), and the result is 11001001 (201). In PHP, you can use the bitwise operator ^ to implement bitwise XOR operations.

Sample code:

$a = 162;
$b = 107;
$c = $a ^ $b; //Press $a and $b Bitwise XOR operation, the result is 201

IV. Bitwise NOT (~) operation

The bitwise NOT operation refers to inverting each bit of the binary number, that is, 1 becomes 0 , 0 becomes 1. For example, performing a bitwise NOT operation on 10100010 (162) results in 01011101 (93). In PHP, you can use the bitwise operator ~ to implement the bitwise NOT operation.

Sample code:

$a = 162;
$b = ~$a; //Perform bitwise NOT operation on $a, the result is 93

5. Left shift (<<) operation

The left shift operation refers to moving the binary number to the left by a certain number of bits and adding 0 on the right. For example, shifting 10100010(162) to the left by 3 bits results in 00010100(20). In PHP, you can use the bitwise operator << to implement the left shift operation.

Sample code:

$a = 162;
$b = $a << 3; //Move $a to the left by 3 bits, the result is 20

6. Right shift (>>) operation

The right shift operation refers to moving a binary number to the right by a number of digits, padding 0 or 1 on the left, and the number of digits moved and the sign of the value. related. For example, shifting 10100010(162) to the right by 3 bits results in 00010100(20). In PHP, you can use the bitwise operator >> to implement the right shift operation.

Sample code:

$a = 162;
$b = $a >> 3; //Move $a to the right by 3 bits, the result is 20

7. Summary

In summary, PHP provides a set of functions for bit operations. Among them, bitwise AND (&), bitwise OR (|) and bitwise XOR (^) are the most common bit operations, bitwise NOT (~), left shift (<<) and right shift (> ;>) is also a commonly used operation. Mastering the use of these bit operations will help improve efficiency in actual programming.

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