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PHP bin2hex() Function

PHP bin2hex() function is used in PHP to convert a given input string in to hexadecinal values. This bin2hex() function doesn’t convert a string to hexadecimal which is representing binary digits. The conversion of the string is done byte-by-byte and the highest nibble will be converted first.

Syntax :

bin2hex($string);

The $string in the parameter is the given input string which is to be converted into the hexadecimal value. We have to only pass $string in the parameter and the function will return the corresponding hexadecimal value.

Let's take an example of the bin2hex() function:

<html>
<body>
<?php 
$str = "PHPTPOINT";
echo bin2hex($str); 
?>
</body>
</html>

Output:
50485054504f494e54

<html>
<body>
<?php 
$str1 = "PHP is a server side scripting language.";
$str2 = "HTML is a client side scripting language";
$str3 = "JAVA is a programming language";
echo $str1."<br>";
echo bin2hex($str1)."<br>";
echo $str2."<br>";
echo bin2hex($str2)."<br>";
echo $str3."<br>";
echo bin2hex($str3)."<br>";
?>
</body>
</html>

Output:
PHP is a server side scripting language.
504850206973206120736572766572207369646520736372697074696e67206c616e67756167652e
HTML is a client side scripting language
48544d4c206973206120636c69656e74207369646520736372697074696e67206c616e6775616765
JAVA is a programming language
4a41564120697320612070726f6772616d6d696e67206c616e6775616765

We can covert the hexadecimal value back to the relative string using the pack() function:

<html>
<body>
<?php
$str = "PHPTPOINT";
echo bin2hex($str) . "<br>";
echo pack("H*",bin2hex($str)) . "<br>";
?> 
</body>
</html>

Output:
50485054504f494e54
PHPTPOINT

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