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run code in 150+ php & hhvm versions
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<?php $array = array( 'test' => 'test1', 'test2' => 'test3' ); echo implode( ',', $array );
Output for 5.2.15 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
test1,test3