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<HTML
><HEAD
><TITLE
>passthru</TITLE
><META
NAME="GENERATOR"
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><BODY
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VLINK="#840084"
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><DIV
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><TABLE
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BORDER="0"
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><TR
><TH
COLSPAN="3"
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>PHP Manual</TH
></TR
><TR
><TD
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ALIGN="left"
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><A
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><HR
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WIDTH="100%"></DIV
><H1
><A
NAME="function.passthru"
>passthru</A
></H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN32077"
></A
><P
> (PHP3 , PHP4 )</P
>passthru --
Execute an external program and display raw output
</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN32080"
></A
><H2
>Description</H2
><DIV
CLASS="funcsynopsis"
><A
NAME="AEN32082"
></A
><P
></P
><P
><CODE
><CODE
CLASS="FUNCDEF"
>void <B
CLASS="function"
>passthru</B
></CODE
> (string command [, int
return_var])</CODE
></P
><P
></P
></DIV
><P
> The <B
CLASS="function"
>passthru()</B
> function is similar to the
<B
CLASS="function"
>Exec()</B
> 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 <B
CLASS="function"
>Exec()</B
> or
<B
CLASS="function"
>System()</B
> 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 <I
CLASS="emphasis"
>image/gif</I
> and
then calling a pbmplus program to output a gif, you can create
PHP scripts that output images directly.</P
><P
> Note that 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
><P
> 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
>, <B
CLASS="function"
>EscapeShellCmd()</B
>,
and the <A
HREF="language.operators.execution.html"
>backtick
operator</A
>.
</P
></DIV
><DIV
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>Home</A
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