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@ 2018-02-12T18:55:58Z

<?php

function testFunction($argument) {    
    return empty($argument) ? 'all' : strtoupper($argument);
}


testFunction('');
testFunction('hello');

Output
Performance
VLD
References
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strtoupper: documentation ( source)

preferences:dark modelive preview

41.66 ms | 402 KiB | 5 Q