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@ 2021-06-16T08:32:55Z

<?php

function format($n){
  return substr($n, 0, 5)."-".substr($n,5,7)."-".substr($n,12,1);
}
print format("12343");

Output
Performance
VLD
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substr: documentation ( source)

preferences:dark modelive preview

61.37 ms | 402 KiB | 5 Q