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[最佳答案] Okay try this, i know the question is really tricky :\ <?php $urls = array( "http://www.this-is-a-url.com", "www.this-is-another-url.com/some-folder", "subdomain.somesub.domain.com/index.php", "diff.erentltd.in", "www.andanotherone.org.uk" ); foreach( $urls as $url ) { var_dump( get_domain( $url ) ); } /** Output **/ // string(17) "this-is-a-url.com" // string(23) "this-is-another-url.com" // string(10) "domain.com&qu