How to convert string from hexadecimal to binary in PHP?

PHP converts a string from hexadecimal to binary by using the hexdec(), decbin() or base_convert() functions. The hexdec() function converts hexadecimal to decimal, and the decbin() function uses For converting decimal to binary. The base_convert() function is used to convert numbers between arbitrary bases.

The following are two methods of using PHP built-in functions to convert hexadecimal strings to binary strings:

Method 1

Use hexdec to convert a hexadecimal string to a numeric binary, and then use decbin to convert a numeric binary value to a binary string:

<?php
 $hexString = "1f";
 $binNumeric = hexdec($hexString);
 $binString = decbin($binNumeric); // = "11111"
?>

Note: The hexdec() function converts the hexadecimal string into a binary string. Convert hexadecimal to decimal. The decbin() function is used to convert decimal to binary.

Method 2

Use base_convert to directly convert a hexadecimal string into a binary string:

<?php
 $hexString = "ff";
 $binString = base_convert($hexString,16,2); // = "11111111"
?>

Note: The base_convert() function is used Convert numbers between arbitrary bases.

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