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run code in 150+ php & hhvm versions
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<? php $input = array( array( 'tag_name' => 'google' ), array( 'tag_name' => 'technology' ) ); echo implode(', ', array_column($input, 'tag_name'));
based on nWiaF
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.32
<? php $input = array( array( 'tag_name' => 'google' ), array( 'tag_name' => 'technology' ) ); echo implode(', ', array_column($input, 'tag_name'));