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<?php var_dump((string)false == (string)"0"); // replaced (boolean) with (string) var_dump((boolean)(string)"false" == (int)0); // added (boolean) to "false"
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.2.0
bool(false) bool(false)
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/5BDMB on line 5
Process exited with code 255.