PHP hex2bin() Function

The hex2bin() function is a built-in function in PHP. The hex2bin() function is used to decode a hexadecimally encoded binary string. That is, it decodes a binary string which is encoded in hexadecimal representation back to binary representation. Note: The purpose of this function is not to convert a hexadecimal number to binary number, to do so we can use the base_convert() function in PHP. This function is just used to decode a hexadecimally encoded binary string. Syntax:

 string hex2bin($hexString) 

Parameters: This function accepts a single parameter $hexString which represents a hexadecimal data which is needed to be decoded to binary representation. Return Value: This function return a string which is the binary representation of the hexa-decimal input $hexString. If this function fails to decode the hexadecimal string to binary then it returns False. Examples:

 Input : $hexString = "48656c6c6f20576f726c6421" Output : Hello World! Input : $hexString = "6578616d706c65206865782064617461" Output : example hex data 

Below programs illustrate the hex2bin() function: Program 1: PHP

<?php echo hex2bin("48656c6c6f20576f726c6421"); ?> 

Output:

 Hello World! 

Program 2: php

<?php echo hex2bin("6578616d706c65206865782064617461"); ?> 

Output:

example hex data

Reference: http://php.net/manual/en/function.hex2bin.php