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PHP bin2hex() Function

Last Updated : 21 Jun, 2023
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The bin2hex() function in PHP converts a string to hexadecimal values. The conversion is done byte-wise with the high-nibble first. Note: It is not for converting strings representing binary digits into hexadecimal. Syntax: 
bin2hex($string)
Parameters: This function accepts a single parameter $string. This is the string that will be converted to hexadecimal values. Return Value: The function returns the hexadecimal value of the string passed in the parameter. Examples: 
Input : string = "geeks"
Output : 6765656b73

Input : string = "1111"
Output : 31313131 
Explanation: "1111" is converted to its hexadecimal 
values, it is not treated as a binary string, else the 
answer would have been F which is not in this case.
Below programs illustrate the bin2hex() function in PHP: Program 1: php 
<?php
// PHP program to demonstrate
// the bin2hex() function 

$str = "geeks";

echo bin2hex($str);

?>
Output: 
6765656b73
Program 2: php 
<?php
// PHP program to demonstrate 
// the bin2hex() function 

$str = "1111";

echo bin2hex($str);

?>
Output: 
31313131
Reference: http://php.net/manual/en/function.bin2hex.php

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