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><H1
><A
NAME="function.unpack"
>unpack</A
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>unpack -- Unpack data from binary string.</DIV
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><A
NAME="AEN17663"
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><H2
>Description</H2
><DIV
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><P
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><CODE
CLASS="FUNCDEF"
>array unpack</CODE
>(string format, string data);<P
></P
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><P
>&#13;     <B
CLASS="function"
>Unpack()</B
> from binary string into array
     according to <TT
CLASS="parameter"
><I
>format</I
></TT
>. Returns array
     containing unpacked elements of binary string.
    </P
><P
>&#13;     <B
CLASS="function"
>Unpack()</B
> works slightly different from Perl as
     the unpacked data is stored in an associative array. To
     accomplish this you have to name the different format codes and
     separate them by a slash /.
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>Example 1. <B
CLASS="function"
>Unpack()</B
> format string</B
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>  1&nbsp;
  2&nbsp;$array = unpack ("c2chars/nint", $binarydata);
  3&nbsp;      </PRE
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><P
>&#13;       The resulting array will contain the entries "chars1",
       "chars2" and "int".
      </P
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>
    </P
><P
>&#13;     For an explanation of the format codes see also:
     <A
HREF="function.pack.html"
><B
CLASS="function"
>pack()</B
></A
>
    </P
><P
>&#13;     Note that PHP internally stores integral values as signed. If you
     unpack a large unsigned long and it is of the same size as PHP
     internally stored values the result will be a negative number
     even though unsigned unpacking was specified.
    </P
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