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Asked: 2026-05-20T16:35:47+00:00

$cities = Amsterdam|Rotterdam|Den Haag $results = mysql_query(SELECT * FROM messages WHERE content REGEXP ‘$cities’);

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$cities = "Amsterdam|Rotterdam|Den Haag"
$results = mysql_query("SELECT * FROM messages WHERE content REGEXP '$cities'");

The above code works great, but if $cities is empty, nothing is selected. I’d like to select all rows if $cities has no value. How can I achieve that? Thanks!

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1 Answer

  1. Editorial Team

    You will need to use a conditional in your php, which removes the where clause when your $cities variable is empty. Alternatively, you can use a regex that matches everything like /^/, but it’s not particularly elegant.

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