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<?php namespace Foo { class Bar { public function example($test = null) { var_dump(isset($test)); } } } namespace { $d = new \Foo\Bar; foreach ([null, 0, '', 0.0, function(){}] as $sample) { $d->example($sample); } }
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true) bool(true) bool(true) bool(true)

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