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An in-depth explanation of how to use three bitwise operators in PHP
- PHPzOriginal
- 2023-04-03 19:41:15689browse
The bitwise operator is a bitwise operator that is used to compare and operate each bit in a binary number. In PHP, the bitwise operator is used to perform bit masking and process binary representation of data. At the same time, the median operator can also be used as a tool to implement some algorithms.
There are three main types of median operators in PHP: bitwise AND, bitwise OR and bitwise XOR.
- Bitwise AND (&)
The bitwise AND operator (&) is a binary operator. It compares each bit of the two operands and if both are 1, the result is 1; otherwise it is 0. For example:
$a = 14; //01110 $b = 7; //00111 $c = $a & $b; //00110
In the above code, $a and $b are the binary numbers 01110 and 00111 respectively. The bitwise AND operator compares each of their bits, resulting in the binary number 00110. Therefore, the value of $c is 6 (the binary number 00110 converts to 6 in decimal).
The bitwise AND operator is mainly used for bit masking (bitmasking). For example, you can use the bitwise AND operator to compare and operate binary numbers and some flag bits. In this way, the status of multiple flag bits can be stored in one variable, thereby reducing the number of variables and memory usage.
- Bitwise OR (|)
The bitwise OR operator (|) is also a binary operator. It compares each bit of the two operands, and if one is 1, the result is 1; otherwise, it is 0. For example:
$a = 14; //01110 $b = 7; //00111 $c = $a | $b; //01111
In the above code, $a and $b are the binary numbers 01110 and 00111 respectively. The bitwise OR operator compares each of their bits, resulting in the binary number 01111. Therefore, the value of $c is 15 (the binary number 01111 converts to 15 in decimal).
The bitwise OR operator is mainly used to combine multiple flag bits. For example, you can use the bitwise OR operator to compare and operate on binary numbers and multiple flag bits. In this way, the status of multiple flag bits can be stored in one variable, thereby reducing the number of variables and memory usage.
- Bitwise XOR (^)
The bitwise XOR operator (^) is also a binary operator. It compares every bit of the two operands and the result is 1 if they are different; otherwise it is 0. For example:
$a = 14; //01110 $b = 7; //00111 $c = $a ^ $b; //01001
In the above code, $a and $b are the binary numbers 01110 and 00111 respectively. The bitwise XOR operator compares each of their bits, resulting in the binary number 01001. Therefore, the value of $c is 9 (the binary number 01001 converts to 9 in decimal).
The bitwise XOR operator is mainly used for comparison and operation between two binary numbers. For example, you can use the bitwise XOR operator to compare two binary numbers and find out which bits they are different from (the positions of 1 and 0), thereby implementing some bit manipulation algorithms.
Summary:
The median operator can be used to process binary representation of data to implement bit masking, flag bit merging and bit operation algorithms. Among them, bitwise AND, bitwise OR and bitwise XOR are the main bitwise operators in PHP. They can compare and operate each bit of the two operands to obtain a new binary number result.
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