Does php convert byte array?

In PHP, one of the very common tasks is to convert a byte array into a string. At this time, developers usually encounter the following questions:

How to convert a byte array into a string?

How to convert a string to a byte array?

In this article, we will discuss these two issues and provide you with the best practices for doing these operations in PHP.

Convert byte array to string

In PHP, you can use the following method to convert byte array to string:

$byteArray = array(72, 101, 108, 108, 111);
$string = implode(array_map("chr", $byteArray));

This example first creates a Contains an array of bytes, then uses array_map to map each byte in the array to an ASCII character, and finally uses implode to combine the characters into a string.

If you are converting binary data (for example, retrieved from a file or database) to a string, you may need to perform padding operations to ensure that the resulting string is of the correct length. For example, if the binary data contains a NULL character, you may need to add padding bytes after it to make it the specified length.

Convert a string to a byte array

In PHP, you can use the following method to convert a string to a byte array:

$string = "Hello";
$bytes = array_map("ord", str_split($string));

In this example, first Created a string and then split it into an array of characters. Next, use array_map to convert each character in the array to its corresponding ASCII code value and store these values ​​in a new array.

If the converted string contains multi-byte characters, you may need to use a multi-byte function (such as mb_substr) to split it into single-byte characters in order to convert it correctly to a byte array. Furthermore, if you want to represent wide characters in a byte array, you need to use multiple bytes to represent each character.

Conclusion

Converting byte array to string or string to byte array is one of the common tasks in PHP. For these tasks, you can use the best practices and tips listed above. Keep in mind that when doing these operations you need to pay attention to how the data is encoded and how long it is.

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