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

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

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><H1
><A
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>exec</H1
><DIV
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><A
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></A
><P
>    (PHP 3, PHP 4 )</P
>exec&nbsp;--&nbsp;Execute an external program</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN78764"
></A
><H2
>Description</H2
>string <B
CLASS="methodname"
>exec</B
> ( string command [, array output [, int return_var]])<BR
></BR
><P
>&#13;     <B
CLASS="function"
>exec()</B
> executes the given
     <TT
CLASS="parameter"
><I
>command</I
></TT
>, however it does not output
     anything.  It simply returns the last line from the result of the
     command.  If you need to execute a command and have all the data
     from the command passed directly back without any interference,
     use the <A
HREF="function.passthru.html"
><B
CLASS="function"
>passthru()</B
></A
> function.
    </P
><P
>&#13;     If the <TT
CLASS="parameter"
><I
>array</I
></TT
> argument is present, then the
     specified array will be filled with every line of output from the
     command.  Line endings, such as <TT
CLASS="literal"
>\n</TT
>, are not
     included in this array.  Note that if the array already contains some 
     elements, <B
CLASS="function"
>exec()</B
> will append to the end of the array.
     If you do not want the function to append elements, call
     <A
HREF="function.unset.html"
><B
CLASS="function"
>unset()</B
></A
> on the array before passing it to
     <B
CLASS="function"
>exec()</B
>.
    </P
><P
>&#13;     If the <TT
CLASS="parameter"
><I
>return_var</I
></TT
> argument is present
     along with the <TT
CLASS="parameter"
><I
>array</I
></TT
> argument, then the
     return status of the executed command will be written to this
     variable.
    </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
></TD
></TR
></TABLE
></DIV
><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.system.html"
><B
CLASS="function"
>system()</B
></A
>,
     <A
HREF="function.passthru.html"
><B
CLASS="function"
>passthru()</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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