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run code in 150+ php & hhvm versions
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<?php $s = "T e s t a n d o"; $array = explode(" ",$s); print_r($array); $s = implode("",$array); var_dump($s);
based on V9Fs3
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => T [1] => e [2] => s [3] => t [4] => a [5] => n [6] => d [7] => o ) string(8) "Testando"