Sophie: php-manual-en-4.3.0-2mdk noarch

php-manual-en-4.3.0-2mdk.noarch.rpm

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><H1
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>passthru</H1
><DIV
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></A
><P
>    (PHP 3, PHP 4 )</P
>passthru&nbsp;--&nbsp;
     Execute an external program and display raw output
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN78807"
></A
><H2
>Description</H2
>void <B
CLASS="methodname"
>passthru</B
> ( string command [, int return_var])<BR
></BR
><P
>&#13;     The <B
CLASS="function"
>passthru()</B
> function is similar to the
     <A
HREF="function.exec.html"
><B
CLASS="function"
>exec()</B
></A
> function in that it executes a
     <TT
CLASS="parameter"
><I
>command</I
></TT
>.  If the
     <TT
CLASS="parameter"
><I
>return_var</I
></TT
> argument is present, the return
     status of the Unix command will be placed here.  This function
     should be used in place of <A
HREF="function.exec.html"
><B
CLASS="function"
>exec()</B
></A
> or
     <A
HREF="function.system.html"
><B
CLASS="function"
>system()</B
></A
> when the output from the Unix command
     is binary data which needs to be passed directly back to the
     browser.  A common use for this is to execute something like the
     pbmplus utilities that can output an image stream directly.  By
     setting the Content-type to <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>image/gif</I
></SPAN
> and
     then calling a pbmplus program to output a gif, you can create
     PHP scripts that output images directly.
    </P
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><B
>Warning</B
></TD
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><TR
><TD
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><P
>&#13;      If you are going to allow data coming from user input to be passed to
      this function, then you should be using
      <A
HREF="function.escapeshellarg.html"
><B
CLASS="function"
>escapeshellarg()</B
></A
> or
      <A
HREF="function.escapeshellcmd.html"
><B
CLASS="function"
>escapeshellcmd()</B
></A
> to make sure that users cannot trick
      the system into executing arbitrary commands.
     </P
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><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      If you start a program using this function and want to leave it running
      in the background, you have to make sure that the output of that program
      is redirected to a file or some other output stream or else PHP will
      hang until the execution of the program ends.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <A
HREF="function.exec.html"
><B
CLASS="function"
>exec()</B
></A
>, <A
HREF="function.system.html"
><B
CLASS="function"
>system()</B
></A
>,
     <A
HREF="function.popen.html"
><B
CLASS="function"
>popen()</B
></A
>, <A
HREF="function.escapeshellcmd.html"
><B
CLASS="function"
>escapeshellcmd()</B
></A
>,
     and the <A
HREF="language.operators.execution.html"
>backtick
     operator</A
>.
    </P
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