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<?php echo mb_substr('РФ', -2, 'UTF-8');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: mb_substr(): Argument #3 ($length) must be of type ?int, string given in /in/0kOeU:2 Stack trace: #0 /in/0kOeU(2): mb_substr('\xD0\xA0\xD0\xA4', -2, 'UTF-8') #1 {main} thrown in /in/0kOeU on line 2
Process exited with code 255.

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