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<?php var_dump((bool) 'true'); var_dump((bool) 'false'); var_dump(!!'false'); var_dump((bool)null); var_dump(boolval('false'));
based on LbopM
Output for 5.5.24 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true) bool(true) bool(true) bool(false) bool(true)
Output for 5.0.0 - 5.4.45
bool(true) bool(true) bool(true) bool(false) Fatal error: Call to undefined function boolval() in /in/jJeqm on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
bool(true) bool(true) bool(true) bool(false) Fatal error: Call to undefined function: boolval() in /in/jJeqm on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
bool(true) bool(true) bool(true) bool(false) Fatal error: Call to undefined function: boolval() in /in/jJeqm on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
bool(true) bool(true) bool(true) bool(false) Fatal error: Call to undefined function: boolval() in /in/jJeqm on line 7