Howto read bytes from string

For example:
The string is: PO3nX+Dk+pjwOtTaFJOgoYYFqmOMO38pKA5NUkgK+gVSi+/6gVor1JfbnUvpjG9YevClBsi
KjOgp9HOY6tF7Pw==

I want to read 0x20 from the beginning of it, And 0x20 from the end of it. Thanks for any help!

 

Is this what you're looking for:

<?php
$string = "PO3nX+Dk+pjwOtTaFJOgoYYFqmOMO38pKA5NUkgK+gVSi+/6gVor1JfbnUvpjG9YevClBsi
KjOgp9HOY6tF7Pw==";
$string_first_part = substr($string, 0, 20);
$strlength = strlen($string);
$strstart = $strlength - 20;
$string_last_part = substr($string, $strstart, 20);

// $string_first_part and $string_last_part contain first and last 20 characters of the string $string.
// do with it what you want below.
?>

PHP:

hans

 

This part could be simplified by:

$string_last_part = substr($string, -20);

PHP:

 

0x20 = 32, not 20

...
$string_first_part = substr($string, 0, 0x20);
$string_last_part = substr($string, -0x20);
...

PHP:

 

Thanks both of you
I'm learning here .. lol
I thought 0x20 just was to say 0 to 20, but had it wrong then

 

BTW, 0xdigit is hexadecimal of digit.

 

Thanks guys.