   #PHP Manual Operators Error Control Operators
   Incrementing/Decrementing Operators

             PHP Manual
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Execution Operators

   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).
   Use of the backtick operator is identical to shell_exec().

   <?php
   $output = `ls -al`;
   echo "<pre>$output</pre>";
   ?>

     Note: The backtick operator is disabled when safe mode is enabled
     or shell_exec() is disabled.

   See also the manual section on Program Execution functions, popen()
   proc_open(), and Using PHP from the commandline.
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