String to byte array in php

Question

How can I get the byte array from some string which can contain numbers  letters and so on  If you are familiar with Java  I am looking for the same functionality of the getBytes   method   I tried a snippet like this one   for  i   0   i  lt  strlen  msg    i          data  ord  msg  i              or  data   ord  msg  1         but without success  so any kind of help will be appreciated   PS  Why do I need this at all   Well  I need to send a byte array via fputs   to a server written in Java

User · Answer

I found several functions defined in http://tw1.php.net/unpack are very useful.
They can covert string to byte array and vice versa.

Take byteStr2byteArray() as an example:

<?php
function byteStr2byteArray($s) {
    return array_slice(unpack("C*", "\0".$s), 1);
}

$msg = "abcdefghijk";
$byte_array = byteStr2byteArray($msg);

for($i=0;$i<count($byte_array);$i++)
{
   printf("0x%02x ", $byte_array[$i]);
}
?>

User · Answer

You could try this    in str    this is a test    hex ary   array    foreach  str split  in str  as  chr         hex ary     sprintf   02X   ord  chr      echo implode      hex ary

User · Answer

Sparr is right  but I guess you expected byte array like byte   in C   It s the same solution as Sparr did but instead of HEX you expected int presentation  range from 0 to 255  of each char  You can do as follows    byte array   unpack  C     The quick fox jumped over the lazy brown dog    var dump  byte array        byte array should be int   which can be converted                            to byte   in C  since values are range of 0 - 255   By using var dump you can see that elements are int  not string       array 44      1   gt   int 84    2   gt   int 104   3   gt   int 101   4   gt   int 32   5   gt  int 113    6   gt   int 117   7   gt   int 105   8   gt   int 99    9   gt   int 107   10   gt  int 32    11   gt  int 102   12   gt  int 111   13   gt  int 120   14   gt  int 32   15   gt  int 106   16   gt  int 117   17   gt  int 109   18   gt  int 112   19   gt  int 101   20   gt  int 100   21   gt  int 32    22   gt  int 111   23   gt  int 118   24   gt  int 101   25   gt  int 114   26   gt  int 32    27   gt  int 116   28   gt  int 104   29   gt  int 101   30   gt  int 32    31   gt  int 108   32   gt  int 97    33   gt  int 122   34   gt  int 121   35   gt  int 32    36   gt  int 98    37   gt  int 114   38   gt  int 111   39   gt  int 119   40   gt  int 110   41   gt  int 32    42   gt  int 100   43   gt  int 111   44   gt  int 103      Be careful  the output array is of 1-based index  as it was pointed out in the comment

User · Answer

PHP has no explicit byte type  but its string is already the equivalent of Java s byte array  You can safely write fputs  connection   The quick brown fox        The only thing you must be aware of is character encoding  they must be the same on both sides  Use mb convert encoding   when in doubt

User · Answer

In PHP  strings are bytestreams  What exactly are you trying to do   Re  edit     Ps  Why do I need this at all   Well I need to send via fputs   bytearray to server written in java       fputs takes a string as argument  Most likely  you just need to pass your string to it  On the Java side of things  you should decode the data in whatever encoding  you re using in php  the default is iso-8859-1

User · Answer

print r unpack  H    The quick fox jumped over the lazy brown dog     Array    1    gt  54686520717569636b20666f78206a756d706564206f76657220746865206c617a792062726f776e20646f67      T   0x54  h   0x68       You can split the result into two-hex-character chunks if necessary

[php] String to byte array in php

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