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run code in 150+ php & hhvm versions
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<?php $test = 'GB82WEST12345698765432'; $test2 = chunk_split ( $test, 4, ' '); echo $test .' ---> ' .$test2."\n";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
GB82WEST12345698765432 ---> GB82 WEST 1234 5698 7654 32