Convert a string value from binary to hex and back in PHP

Description

The following code shows how to convert a string value from binary to hex and back.

Example

//from w w w.ja  va  2s  . c o  m
<?php
    $str = "Hello world!";
    echo bin2hex($str) . "<br>";
    echo pack("H*",bin2hex($str)) . "<br>";
?>

The code above generates the following result.