以下代码可能会有所帮助(请参阅MadTechie的最新文章):

This code may be helpful (see MadTechie's latest post):

http://www.phpfreaks.com/forums/index.php/topic，245248.msg1146218.html#msg1146218

<?php
$string = "some random text http://tinyurl.com/9uxdwc some http://google.com random text http://tinyurl.com/787988";

$regex = '$\b(https?|ftp|file)://[-A-Z0-9+&@#/%?=~_|!:,.;]*[-A-Z0-9+&@#/%=~_|]$i';

preg_match_all($regex, $string, $result, PREG_PATTERN_ORDER);
$A = $result[0];

foreach($A as $B)
{
   $URL = GetRealURL($B);
   echo "$URL<BR>";   
}


function GetRealURL( $url ) 
{ 
   $options = array(
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_HEADER         => true,
      CURLOPT_FOLLOWLOCATION => true,
      CURLOPT_ENCODING       => "",
      CURLOPT_USERAGENT      => "spider",
      CURLOPT_AUTOREFERER    => true,
      CURLOPT_CONNECTTIMEOUT => 120,
      CURLOPT_TIMEOUT        => 120,
      CURLOPT_MAXREDIRS      => 10,
   ); 

   $ch      = curl_init( $url ); 
   curl_setopt_array( $ch, $options ); 
   $content = curl_exec( $ch ); 
   $err     = curl_errno( $ch ); 
   $errmsg  = curl_error( $ch ); 
   $header  = curl_getinfo( $ch ); 
   curl_close( $ch ); 
   return $header['url']; 
}  

?>