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@ 2018-10-21T14:09:38Z

<?php

foreach (get_defined_functions()['internal'] as $f) {
	$rf = new ReflectionFunction($f);
	foreach ($rf->getParameters() as $p) {
		if ($p->isPassedByReference()) {
			echo $f, PHP_EOL;
			break;
		}
	}
}

Output
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get_defined_functions: documentation ( source)

preferences:dark modelive preview

54.5 ms | 402 KiB | 5 Q