How to convert hexadecimal to file in php

PHP is a commonly used server-side programming language, and hexadecimal file conversion is a programming technique that converts hexadecimal data into binary data. In this article, we will introduce how to use PHP to write a simple hexadecimal file conversion tool.

Before we start, we need to understand some basic knowledge. The first is the representation method of hexadecimal numbers. Each hexadecimal number consists of one or more of the 16 characters 0~9 and A~F. For example, the hexadecimal representation of the decimal number 10 is A, and the hexadecimal representation of the decimal number 255 is FF.

Secondly, we need to understand the structure of the binary file. Binary files are composed of some binary data, including file header and file body and other information. The file header usually contains some specific tags to identify the file type and format and other information, and occupies a certain position and byte length in the file. The file body is the actual data of the file, which is usually read and interpreted by the parser.

Now, let us start writing our hexadecimal file conversion tool. First, we need to create a PHP file and write the following code:

<?php

//打开文件
$file = fopen("output.bin", "wb+");

//写入16进制数据
$data = "\x48\x65\x6C\x6C\x6F\x20\x57\x6F\x72\x6C\x64";
fwrite($file, $data);

//关闭文件
fclose($file);

echo "16进制数据已转换为二进制文件并保存为output.bin。\n";

?>

As shown in the above code, we first use PHP's fopen() function to create a file named The binary file of output.bin, and open the file in wb mode before writing the hexadecimal data so that we can write to the file. Then, we define a string containing hexadecimal data and use the fwrite() function to write the string to the open file. Finally, we use the fclose() function to close the file and output a prompt message indicating that the program has run successfully.

If we run this code, the program will create a file named output.bin in the current directory, which contains binary information corresponding to hexadecimal data. We can now use any binary data parser to view the file and confirm that it contains the correct data.

In practical applications, we can generate binary files by reading hexadecimal data, and use them in scenarios such as network transmission and file encryption and decryption. In addition, we can also obtain the data information by reading binary files, and apply them in fields such as data processing and analysis. Therefore, mastering the skills of converting hexadecimal files is of great significance to PHP developers.

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