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<?php $a = 1; $$a = 1; ${$a++} = 2; var_dump(${1}); var_dump($a); var_dump(${2});
Output for git.master, git.master_jit, rfc.property-hooks
int(2) int(2) Warning: Undefined variable $2 in /in/16qPd on line 7 NULL

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