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<?php function foo1() { echo __FUNCTION__, "\n"; } class Foo { static function do_foo() { echo __METHOD__, "\n"; } } $funs = array( 'foo1', 'Foo::do_foo', array(new Foo(), 'do_foo'), function () { echo __FUNCTION__, "\n"; }, ); foreach ($funs as $fun) { echo "direct call: "; $fun(); echo "call_user_func(): "; call_user_func($fun); }
Output for git.master, git.master_jit, rfc.property-hooks
direct call: foo1 call_user_func(): foo1 direct call: Foo::do_foo call_user_func(): Foo::do_foo direct call: Foo::do_foo call_user_func(): Foo::do_foo direct call: {closure} call_user_func(): {closure}

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