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@ 2018-09-22T13:26:12Z

<?php
$reflection = new ReflectionFunction('\hash_update_file');

foreach ($reflection->getParameters() as $parameter) {
    echo sprintf('$%s', $parameter->getName()) . PHP_EOL;
}

Output
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sprintf: documentation ( source)

preferences:dark modelive preview

79.32 ms | 402 KiB | 5 Q