Detailed introduction to binary functions in PHP

In computer science, binary is a representation of numbers. It has only two values, 0 and 1. Binary is widely used in computer systems, especially in data transmission and storage. In PHP, binary functions help convert between numbers and binary. Binary functions in PHP will be introduced in detail below.

In PHP, the method to convert a decimal number into a binary number is to use the decbin() function.

$number = 65;
$binary = decbin($number);
echo $binary; // 输出: 1000001

The above code converts the number 65 into the binary number 1000001. The decbin() function accepts only one parameter, the decimal number to be converted, and it returns a binary string representing the number.

Instead, we can use the bind() function to convert a binary number to a decimal number.

$binary = '1000001';
$number = bindec($binary);
echo $number; // 输出: 65

The above code converts the binary number 1000001 to the number 65. The bindec() function accepts a string representing a binary number as a parameter and returns a decimal number representing that number.

In PHP 5.4 and above, some new binary functions were introduced, such as bin2hex() and hex2bin(). The bin2hex() function is used to convert binary data to hexadecimal, while the hex2bin() function is used to convert hexadecimal data to binary.

The following is an example of the bin2hex() function:

$data = 'Hello World!';
$binary_data = bin2hex($data);
echo $binary_data; // 输出: 48656c6c6f20576f726c6421

The above code converts the string "Hello World" into binary data and then converts it into a hexadecimal string. The bin2hex() function accepts only one parameter, the binary data to be converted to hexadecimal.

The following is an example of the hex2bin() function:

$hex_data = '48656c6c6f20576f726c6421';
$binary_data = hex2bin($hex_data);
echo $binary_data; // 输出: Hello World!

The above code converts the hexadecimal string "48656c6c6f20576f726c6421" into binary data and then converts it into "Hello World!" characters string. The hex2bin() function accepts only one parameter, the hexadecimal data to be converted to binary.

In PHP, the bindec(), decbin(), bin2hex(), and hex2bin() functions help convert between numbers and binary. These functions perform common binary conversion tasks and are useful when working with binary data.

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