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<?php print_r(substr(2,0, "高危错类信息"));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: substr(): Argument #3 ($length) must be of type ?int, string given in /in/Ev3e6:3 Stack trace: #0 /in/Ev3e6(3): substr('2', 0, '\xE9\xAB\x98\xE5\x8D\xB1\xE9\x94\x99\xE7\xB1\xBB\xE4\xBF\xA1...') #1 {main} thrown in /in/Ev3e6 on line 3
Process exited with code 255.

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