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<?php namespace Rofl\Quack{ const BAR = "bar"; } namespace Bar\Qux{ use const \Rofl\Quack\BAR; const FOO = 1; function whatever( int $p0 = FOO, int $p1 = BAR, string $p2 = \Rofl\Quack\BAR . 'lit' ){} } namespace{ $RF = new ReflectionFunction(\Bar\Qux\whatever::CLASS); var_dump($RF->getParameters()[0]->getDefaultValueConstantName()); var_dump($RF->getParameters()[1]->getDefaultValueConstantName()); var_dump($RF->getParameters()[2]->getDefaultValueConstantName()); }
Output for 5.6.4 - 5.6.29, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
string(11) "Bar\Qux\FOO" string(14) "Rofl\Quack\BAR" NULL
Output for 5.6.0 - 5.6.3
Fatal error: Default value for parameters with a class type hint can only be NULL in /in/PGN2a on line 9
Process exited with code 255.

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