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run code in 150+ php & hhvm versions
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<?php function rpcStructToArray(array $data, $struct) { return rpcKeyValToArray( $data['methodResponse']['params']['param']['value']['struct'][$struct] ); } function rpcKeyValToArray(array $data) { $output = []; foreach ($data as $d) { $key = $d['name']; $value = $d['value']; $output[$key] = $value[key($value)]; } return $output; } $data = [ 'methodResponse' => [ 'params' => [ 'param' => [ 'value' => [ 'struct' => [ 'member' => [ [ 'name' => 'member_id', 'value' => [ 'string' => 4958 ] ], [ 'name' => 'name', 'value' => [ 'string' => 'Username', ] ] ] ] ] ] ] ] ]; $member = rpcStructToArray($data, 'member'); var_dump($member);
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { ["member_id"]=> int(4958) ["name"]=> string(8) "Username" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/8QJS2 on line 10
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/8QJS2 on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/8QJS2 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/8QJS2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/8QJS2 on line 3
Process exited with code 255.