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<?php // Variable variable. $a = 'b'; $b = 'target'; var_dump($$a == $b); // Anon function with inclusion of scope. $fn = function($c) { var_dump($$c == 'target'); }; $fn($a); // I can use scope within using variable variable. $fn = fn($c) => $$c == 'target'; var_dump($fn($a)); // I can't return it though. $fn = fn($c) => $$c; var_dump($fn($a));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) Warning: Undefined variable $b in /in/LrCEX on line 9 bool(false) Warning: Undefined variable $b in /in/LrCEX on line 14 bool(false) Warning: Undefined variable $b in /in/LrCEX on line 18 NULL

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