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<?php function f($data) { var_dump($data); var_dump(filter_var($data, FILTER_VALIDATE_INT)); echo PHP_EOL; } f(null); f(false); f(0); f("0"); f(1); f("1"); f(array()); f(array(0)); f(array(1)); class ToStringAble { function __toString() { return "0"; } } f(new ToStringAble()); f(new stdclass());
Output for 5.2.11 - 5.2.17, 5.3.1 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
NULL bool(false) bool(false) bool(false) int(0) int(0) string(1) "0" int(0) int(1) int(1) string(1) "1" int(1) array(0) { } bool(false) array(1) { [0]=> int(0) } bool(false) array(1) { [0]=> int(1) } bool(false) object(ToStringAble)#1 (0) { } int(0) object(stdClass)#1 (0) { } bool(false)
Output for 5.2.0 - 5.2.10, 5.3.0
NULL bool(false) bool(false) bool(false) int(0) int(0) string(1) "0" int(0) int(1) int(1) string(1) "1" int(1) array(0) { } bool(false) array(1) { [0]=> int(0) } bool(false) array(1) { [0]=> int(1) } bool(false) object(ToStringAble)#1 (0) { } int(0) object(stdClass)#1 (0) { } Catchable fatal error: Object of class stdClass could not be converted to string in /in/Y2L95 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
NULL Fatal error: Call to undefined function filter_var() in /in/Y2L95 on line 5
Process exited with code 255.
Output for 4.4.5 - 4.4.9
NULL Fatal error: Call to undefined function: filter_var() in /in/Y2L95 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
NULL Fatal error: Call to undefined function: filter_var() in /in/Y2L95 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
NULL Fatal error: Call to undefined function: filter_var() in /in/Y2L95 on line 5

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