How to convert PHP file to byte array

When writing PHP code, it is often necessary to convert files into byte arrays. Generally speaking, this is to facilitate binary operations. In this article, we will explain how to convert PHP files to byte arrays.

Method 1: Use the file_get_contents() function

The file_get_contents() function can return the contents of a file and store it as a string. We can use this function to read the contents of a binary file and convert it into a byte array.

The following is a sample code:

$file_contents = file_get_contents("myfile.bin");
$byte_array = unpack("C*", $file_contents);
print_r($byte_array);

In the above code, the file_get_contents() function is used to get the binary contents of the "myfile.bin" file. The unpack() function then converts the file contents into a byte array and stores it in the $byte_array variable. Finally, we use the print_r() function to print out the contents of the byte array.

Method 2: Use the fread() and fseek() functions

Another method is to use the fread() function to read the file content, and then use The fseek() function moves the file pointer to the next byte. The following is a sample code:

$file = fopen("myfile.bin", "rb");
$byte_array = array();
while (!feof($file)) {
    array_push($byte_array, ord(fread($file, 1)));
    fseek($file, 1, SEEK_CUR);
}
fclose($file);
print_r($byte_array);

In the above code, we use the fopen() function to open the file and position the file pointer to the beginning of the file. Then, we use a while loop to read the contents of each byte and save it in the byte array $byte_array. Finally, we use the print_r() function to print out the contents of the byte array.

It should be noted that after each byte is read, we use the fseek() function to move the file pointer to the next byte. This is because each byte is contiguous in the binary file, and the fread() function only reads one byte.

Conclusion

No matter which method you choose, converting a PHP file to a byte array is very simple. You can easily read file contents and convert them into a byte array using the file_get_contents() function or the fread() function. This facilitates binary operations such as encryption, compression, and image processing.

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