How to convert hexadecimal string to binary string in PHP

php editor Strawberry brings you a detailed explanation of how PHP converts hexadecimal strings into binary strings. In actual development, we often encounter situations where we need to convert hexadecimal strings into binary strings. This article will introduce you to the methods and techniques to achieve this conversion, allowing you to easily handle your data conversion needs. Let’s explore this fun and practical topic together!

How to convert hexadecimal string to binary string

Foreword: Hexadecimal and binary are two number systems commonly used in computer science. In some cases, it is necessary to convert a hexadecimal string to a binary string. This article will explore how to achieve this conversion using php.

Conversion method in PHP:

hex2bin() function: PHP provides a built-in function hex2bin() to directly convert a hexadecimal string to a binary string. This function receives a hexadecimal string as input and returns a string representing the binary value of that string.

Example:

$hex_str = "4A76";
$bin_str = hex2bin($hex_str);
echo $bin_str; // Output: 0100101001110110

bin2hex() function: The bin2hex() function does the opposite of hex2bin(), it converts a binary string to a hexadecimal string.

Example:

$bin_str = "0100101001110110";
$hex_str = bin2hex($bin_str);
echo $hex_str; // Output: 4A76

Use for loop: For more flexible conversions, the conversion can be done manually using a for loop. This involves converting each bit of the hexadecimal string to its corresponding binary value.

Example:

$hex_str = "4A76";
$bin_str = "";

for ($i = 0; $i < strlen($hex_str); $i ) {
$hex_digit = substr($hex_str, $i, 1);
$bin_digit = decbin(hexdec($hex_digit));

// If the number of binary digits is 1, add 0 in front
if (strlen($bin_digit) == 1) {
$bin_digit = "0" . $bin_digit;
}

$bin_str .= $bin_digit;
}

echo $bin_str; // Output: 0100101001110110

Choose the appropriate method: The choice of conversion method depends on the specific scenario. The hex2bin() function is the simplest and most straightforward method, suitable for fast, one-time conversions. For more fine-grained control or if you need custom transformations, consider using a for loop.

Precautions:

• The hexadecimal string must contain valid hexadecimal characters (0-9, A-F).
• The binary string will contain 0 and 1 bits.
• Ensure that the input string is not empty or contains non-hexadecimal characters.
• If the length of the hexadecimal string is not even, add a leading 0 before conversion.

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