shell_exec
    (PHP 4, PHP 5)
shell_exec -- Execute command via shell and return the complete output as a string
Description
string 
shell_exec ( string cmd )
   This function is identical to the backtick operator.
  
Parameters
   
- cmd
 
       The command that will be executed.
      
 
  Return Values
   The output from the executed command.
  
Examples
   
Example 1. A shell_exec() example 
<?php $output = shell_exec('ls -lart'); echo "<pre>$output</pre>"; ?>
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  Notes
Note: 
    This function is disabled in safe mode.