Question

Assume in the below code that there is a match for #bob and #test, what would be the preg_replace expression so that #bob and #to are urls (ie http://test.com/read.php?id=bob)? Note there is no hashtag in the id=bob part.

$text = "my name is #bob and I like #to #test things.";

preg_match_all("/(#\w+)/", $text, $matches);

foreach($matches['0'] as $match){

$substring = substr($match, 1);


$titlerows = mysql_num_rows(mysql_query("SELECT title FROM title WHERE title='$substring'"));

if($titlerows == 1) {

    $text = preg_replace('/$match/', replace?? , $text);

}

}

echo $text;

Answer 1

Like FeRtoll’s answer, but this takes advantage of the fact that we already did the substr() earlier:

$text = preg_replace("/$match/", "http://test.com/read.php?id=.$substring", $text);

For the more complex replacement in the comment, do:

$text = preg_replace("/$match/", "<a href='http://test.com/read.php?id=$substring'>$match</a>", $text);

I like interpolation rather than concatenation.