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

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>Execution Operators</H1
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>&#13;    PHP supports one execution operator: backticks (``). Note that
    these are not single-quotes! PHP will attempt to execute the
    contents of the backticks as a shell command; the output will be
    returned (i.e., it won't simply be dumped to output; it can be
    assigned to a variable).
    <DIV
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>$output = `ls -al`;
echo "&#60;pre&#62;$output&#60;/pre&#62;";</PRE
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>
   </P
><DIV
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><P
><B
>Note: </B
>
     The backtick operator is disabled when <A
HREF="features.safe-mode.html#ini.safe-mode"
>safe mode</A
> is enabled
     or <A
HREF="function.shell-exec.html"
><B
CLASS="function"
>shell_exec()</B
></A
> is disabled.
    </P
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><P
>&#13;    See also <A
HREF="function.escapeshellcmd.html"
><B
CLASS="function"
>escapeshellcmd()</B
></A
>, <A
HREF="function.exec.html"
><B
CLASS="function"
>exec()</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.shell-exec.html"
><B
CLASS="function"
>shell_exec()</B
></A
>, and <A
HREF="function.system.html"
><B
CLASS="function"
>system()</B
></A
>.
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