3v4l.org

run code in 200+ php & hhvm versions
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<?php $input = array( array( 'tag_name' => 'google', 'a2' => 'google' ), array( 'tag_name' => 'technology', 'a2'=> 'google' ) ); echo implode(', ', array_map(function ($entry) { return $entry['tag_name'] . $entry['a2']; }, $input));