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run code in 150+ php & hhvm versions
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<?php echo serialize( array( 'de' => 'slug-1', 'en' => 'slug-1-en' ) );
based on CEBRn
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
a:2:{s:2:"de";s:6:"slug-1";s:2:"en";s:9:"slug-1-en";}