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run code in 150+ 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));
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.4.30
Parse error: syntax error, unexpected ',' in /in/lYfRD on line 14
Process exited with code 255.