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@ 2017-07-13T12:49:01Z

<?php

declare(strict_types=1);

function testParam(?string $arg = null){
	var_dump($arg);
}

testParam(null);
testParam("hi");
testParam();

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

31.24 ms | 402 KiB | 5 Q