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<?php var_dump(1, (bool) 1); var_dump(0, (bool) 0); var_dump('1', (bool) '1'); var_dump('1kljf;hag', (bool) '1kljf;hag'); var_dump((bool) array()); var_dump((bool) array(0));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(1) bool(true) int(0) bool(false) string(1) "1" bool(true) string(9) "1kljf;hag" bool(true) bool(false) bool(true)

preferences:
259.08 ms | 406 KiB | 352 Q