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<?php $input = array( array( 'tag_name' => 'google' ), array( 'tag_name' => 'technology', 'tag_name2' => 'yahoo', 'tag_name3' => 'technology', 'tag_name4' => 'google', array( 'tag_name' => 'bing', 'tag_name2' => 'technology', ) ), ); echo implode(', ', array_map(function ($entry) { return $entry['tag_name']; }, $input));

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