how do that in str_replace

I have a guestbook, and I want to convert site address in the following [link]www.yahoo.com[/link] to <a>...

S开发者_开发技巧o how is it do that str_replace?

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str_replace is not powerful enough to do this. You can use preg_replace:

$res = preg_replace('#\\[link\\](?![^:]+script:)([^:<"\\[]+:)?([^<"\\[]+)\\[/link\\]#e',
                    "'<a href=\"'.('\\1'?'\\1':'http://').'\\2\">click here</a>'",
                    $input);

Example: http://www.ideone.com/lTknX

But it's better to use a BBCode parser.

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This should do that for you:

$string = "[link]www.yahoo.com[/link]";

echo preg_replace("/\[link\](.*)\[\/link\]/", "<a href='$1'>click here</a>", $string);