replace every 8 letters in a string

DigitalExpl0it

Im trying to convert a string to another sting.

here is an example

01010100010010000100100101010011 0100100101010011 01000001 01010100010001010101001101010100

I need to convert every 8 chrs to a single chr. the above should say

this is a test

not really sure how to do it..

right now I convert text to the above numbers

$new = eregi_replace( " ", "$gospacer", $new ); 
$new = eregi_replace( "A", "01000001", $new );
$new = eregi_replace( "B", "01000010", $new );
$new = eregi_replace( "C", "01000011", $new );
$new = eregi_replace( "D", "01000100", $new );
$new = eregi_replace( "E", "01000101", $new );
$new = eregi_replace( "F", "01000110", $new );
$new = eregi_replace( "G", "01000111", $new );
$new = eregi_replace( "H", "01001000", $new );
$new = eregi_replace( "I", "01001001", $new );
$new = eregi_replace( "J", "01001010", $new );
$new = eregi_replace( "K", "01001011", $new );
$new = eregi_replace( "L", "01001100", $new );
$new = eregi_replace( "M", "01001101", $new );
$new = eregi_replace( "N", "01001110", $new );
$new = eregi_replace( "O", "01001111", $new );
$new = eregi_replace( "P", "01010000", $new );
$new = eregi_replace( "Q", "01010001", $new );
$new = eregi_replace( "R", "01010010", $new );
$new = eregi_replace( "S", "01010011", $new );
$new = eregi_replace( "T", "01010100", $new );
$new = eregi_replace( "U", "01010101", $new );
$new = eregi_replace( "V", "01010110", $new );
$new = eregi_replace( "W", "01010111", $new );
$new = eregi_replace( "X", "01011000", $new );
$new = eregi_replace( "Y", "01011001", $new );
$new = eregi_replace( "Z", "01011010", $new );

trying to use eregi_replace isnt working right, it wont conver the correct numbers

Smifffy

have you tried swapping them round cos it looks like you are replacin A with 01000001 instead of 01000001 with A if that makes any sense

pdaoust

Hmmmmmmm... here are a few ideas. First of all, is it possible, in your application, to use "00100000" instead of blank spaces? If so, then you could go:

$newArray = chunk_split($new, 8); // splits whole array into 8-character chunks
$newString = ""; // create a string; this is where the decoded stuff will go
for ($counter = 0; $counter < count($newArray); $counter ++) {
    $thisChar = $newArray[$counter]; // assigns current array value to a char -- not necessary, but more clear
    $thisChar = bindec($thisChar); // converts binary number to decimal notation
    $thisChar = ord($thisChar); // converts decimal number to its ASCII equivalent
    $newString .= $thisChar // adds value to string
}
print $newString; // should print out the entire decoded string.

This way, you don't have to use a regex function for every single character; all 255 ASCII values are taken care of in one fell swoop using the ord() function.

HTH!
Paul

DigitalExpl0it

Originally posted by pdaoust
Hmmmmmmm... here are a few ideas. First of all, is it possible, in your application, to use "00100000" instead of blank spaces? If so, then you could go:
$newArray = chunk_split($new, 8); // splits whole array into 8-character chunks
$newString = ""; // create a string; this is where the decoded stuff will go
for ($counter = 0; $counter < count($newArray); $counter ++) {
    $thisChar = $newArray[$counter]; // assigns current array value to a char -- not necessary, but more clear
    $thisChar = bindec($thisChar); // converts binary number to decimal notation
    $thisChar = ord($thisChar); // converts decimal number to its ASCII equivalent
    $newString .= $thisChar // adds value to string
}
print $newString; // should print out the entire decoded string.
This way, you don't have to use a regex function for every single character; all 255 ASCII values are taken care of in one fell swoop using the ord() function.

HTH!
Paul [/B]

yeah I will need the spaces

DigitalExpl0it

Originally posted by pdaoust
Hmmmmmmm... here are a few ideas. First of all, is it possible, in your application, to use "00100000" instead of blank spaces? If so, then you could go:
$newArray = chunk_split($new, 8); // splits whole array into 8-character chunks
$newString = ""; // create a string; this is where the decoded stuff will go
for ($counter = 0; $counter < count($newArray); $counter ++) {
    $thisChar = $newArray[$counter]; // assigns current array value to a char -- not necessary, but more clear
    $thisChar = bindec($thisChar); // converts binary number to decimal notation
    $thisChar = ord($thisChar); // converts decimal number to its ASCII equivalent
    $newString .= $thisChar // adds value to string
}
print $newString; // should print out the entire decoded string.
This way, you don't have to use a regex function for every single character; all 255 ASCII values are taken care of in one fell swoop using the ord() function.

HTH!
Paul [/B]

tryed it, but it might see two binary codes together and make one letter not two

111010h00

which I have had

pdaoust

If you need the spaces, I have two ideas: First, you could explode the string into arrays (using " " as a separator), then chunk_split each of those arrays into the 8-piece arrays in my example. That creates a lot of recursive arrays though...

Another idea is to eregi_replace the " " with "00100000", and fire it through my example. The "00100000"s will all be converted back to " "s, and then you can eregi_replace the " " with "$gospacer" like you originally wanted.