How do I linkify urls in a string with php?

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You can use the following:

$string = "Look on http://www.google.com";
$string = preg_replace(
              "~[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]~",
              "<a href=\"\\0\">\\0</a>", 
              $string);

PHP versions < 5.3 (ereg_replace) otherwise (preg_replace)

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