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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,(0)));
based on eiGXE
Output for 5.5.24 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.4.45
Fatal error: Call to undefined function array_column() in /in/nWiaF on line 10
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_column() in /in/nWiaF on line 10
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_column() in /in/nWiaF on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_column() in /in/nWiaF on line 10