How do I change integer string to hex in php?

Question

I'm a beginner at php so please forgive me if this seems like a noobish question. I've been reading tutorials and the php manual but I can figure this out.

How do I take a variable with an integer string data and output it as the hex character?

for example

<?php

$data = "65";

$the_e = "\x".$data;

echo $the_e;

?>

outputs the string "\x65" when I want the character 'e'. Is there a simple way to do this I've been looking for a work-around but I need to have the hexcode from a variable or I'd need a switch statement that handles each byte.

<?php

$data = $_POST[variable];

switch($data){

case "00":

echo "\x00";

break;

case "01":

echo "\x01";

break;

ect...

?>

I'd really rather not do that for obvious reasons. If anybody know how to do this or has a better work-around please let me know, thanks.

Frxstrem · Accepted Answer

There are two PHP functions that does conversion between integers and characters:

<?php
$char = "e";
$int = 65;

$char == chr($int); # true, as chr(65) is 'e'
$int == ord($char); # true, as ord('e') is 65
?>

So, to summarize, chr() converts and integer to a character and ord() does the opposite.

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How do I change integer string to hex in php?

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