Byte array in PHP

Question

I have a a php string:

e.g. df299cc4cda279e4d7344b42a8006d94488c753f

This is representing a 20 bit HEX output. How would I select the n'th byte? For example if I select the 3rd one it should return 9c.

Thanks.

Bas Slagter · Accepted Answer · 2011-10-31 12:32:24Z

3

You can take a look at chunk_split() or str_split() and get a result like:

$string = "df299cc4cda279e4d7344b42a8006d94488c753f";
$bytes = str_split($string, 2); 
$yourByte = $bytes[2];

answered Oct 31, 2011 at 12:32

Bas Slagter

9,9479 gold badges50 silver badges81 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

deceze · Accepted Answer · 2011-10-31 12:31:59Z

1

$bytes = str_split($string, 2);
echo $bytes[2];

Or you may want to convert the string to actual binary using hex2bin, then echo the index [2] of the string, possibly converting back to hex for output.

answered Oct 31, 2011 at 12:31

deceze♦

525k89 gold badges806 silver badges954 bronze badges

Comments

socha23 · Accepted Answer · 2011-10-31 12:32:16Z

1

Given $n = byte number (3 in your example) and $data = string with hex output,

return substr($data, ($n - 1) * 2, 2)

answered Oct 31, 2011 at 12:32

socha23

10.3k3 gold badges30 silver badges25 bronze badges

Collectives™ on Stack Overflow

Byte array in PHP

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related