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run code in 200+ php & hhvm versions
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<?php echo Serialize ( array ( 'page' => 1, 'per_page' => 100, 'fields' => array( 'last_updated' => true, 'downloaded' => true, 'icons' => true ) ) );
based on rAXCj
Output for 4.3.0 - 7.2.0
a:3:{s:4:"page";i:1;s:8:"per_page";i:100;s:6:"fields";a:3:{s:12:"last_updated";b:1;s:10:"downloaded";b:1;s:5:"icons";b:1;}}