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   echo hex2bin("48656c6c6f20576f726c6421");   ?> |
Output:
Hello World!
Program 2:
<?php   echo hex2bin("6578616d706c65206865782064617461");   ?> |
Output:
example hex data
