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<?php $b = 'b_global'; function foo(bool $shadow) { $a = 'a_local'; $b = 'b_local'; var_dump($a, $b); if ( $shadow ) { static $a; global $b; } var_dump($a, $b); } foo(true); echo "----\n"; foo(false);
Output for 8.1.34, 8.2.30 - 8.2.32, 8.3.5 - 8.3.33, 8.4.9 - 8.4.24, 8.5.0 - 8.5.9
string(7) "a_local" string(7) "b_local" NULL string(8) "b_global" ---- string(7) "a_local" string(7) "b_local" string(7) "a_local" string(7) "b_local"

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