How to convert hexadecimal floating point number to real number in php

PHP is a widely used programming language with concise syntax and easy to learn and use. In PHP, floating point numbers are a very important data type, and hexadecimal floating point numbers are a common representation of floating point number types. This article will explain how to convert hexadecimal floating point numbers to real numbers.

In PHP, you can use the hex2bin function to convert hexadecimal numbers into binary numbers. For example, we can use the following code to convert the hexadecimal number 0x4054000000000000 into the binary number $b: , this number is based on the IEEE 754 standard, with 0.25 represented in double-precision floating-point format.

Next, we need to use the unpack function to convert the binary number into a real number. The unpack function can unpack binary data into multiple variables and parse it according to the specified format.

When parsing double-precision floating point numbers into real numbers, we need to use the format character d. For example, if you want to parse the data in variable $b into a real number, you can use the following code:

$hex = '4054000000000000';
$b = hex2bin($hex);

At this time, the value of variable $result is the real number 0.25.

In actual development, we may need to convert multiple hexadecimal floating point numbers into real numbers and store them in an array. The following is a simple example code:

$result = unpack('d', $b)[1];

The code first defines an array $hex_array containing two hexadecimal floating point numbers. Then, use a foreach loop to iterate through each hex number in $hex_array, convert them to real numbers, and store the results in a new array $float_array. Finally, use the print_r function to output the contents of $float_array.

Running the above code, we can get the following output:

$hex_array = ['4054000000000000', '4004000000000000'];
$float_array = [];

foreach ($hex_array as $hex) {
    $b = hex2bin($hex);
    $float = unpack('d', $b)[1];
    $float_array[] = $float;
}

print_r($float_array);

This output shows that after conversion, the first hexadecimal number in $hex_array is parsed into 0.25, and the second A hexadecimal number is parsed to 0.5.

In summary, the method to convert hexadecimal floating point numbers into real numbers is very simple, just use the hex2bin and unpack functions. It should be noted that when parsing a double-precision floating point number into a real number, the format character d needs to be used. Understanding these contents can help developers make better use of PHP's features and functions and improve program efficiency and performance.

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