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<?php const SDFH=2; class A{ public function sdfh(){ echo 'asdgf'; } } $a= new A(); $b=SDFH; var_dump($a->{$b});
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined property: A::$2 in /in/k7eCX on line 13 NULL

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