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@ 2014-08-04T13:05:20Z

<?php
$iban = 'NL 35 RABO1123123123';

echo str_replace(' ', '', strtoupper($iban));

Output
Performance
VLD
References
Branches

str_replace: documentation ( source)
strtoupper: documentation ( source)

preferences:dark modelive preview

47.51 ms | 402 KiB | 5 Q