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<?php function trues() { foreach(get_defined_constants() as $k => $v) if(strtolower($k) === "true") var_dump($k,v); } trues(); echo "----\n"; define('TRUE', 3); trues();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "v" in /in/lcm1Ti:5 Stack trace: #0 /in/lcm1Ti(8): trues() #1 {main} thrown in /in/lcm1Ti on line 5
Process exited with code 255.

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