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 curl_exec    (PHP 4 >= 4.0.2, PHP 5) curl_exec -- Perform a CURL sessionDescriptionmixed curl_exec  ( resource ch) 
     This function should be called after you initialize a CURL
     session and all the options for the session are set.  Its purpose
     is simply to execute the predefined CURL session (given by the
     ch).
      | 例子 1. 
       Initializing a new CURL session and fetching a webpage
       | 
<?php// create a new curl resource
 $ch = curl_init();
 
 // set URL and other appropriate options
 curl_setopt($ch, CURLOPT_URL, "http://www.example.com/");
 curl_setopt($ch, CURLOPT_HEADER, 0);
 
 // grab URL and pass it to the browser
 curl_exec($ch);
 
 // close curl resource, and free up system resources
 curl_close($ch);
 ?>
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 | 
 注: 
      If you want to have the result returned instead of it being printed to the
      browser directly, use the CURLOPT_RETURNTRANSFER option of
      curl_setopt().
     
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