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<?php session_start(); function foo() { $t = '_SESSION'; $a = $$t; // not work $b = ${'_SESSION'}; // works var_dump($a, $b); } foo();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $_SESSION in /in/ZZB0I on line 6 NULL array(0) { }

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