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<?php $int = 'x'; $bool = 'flase'; $string = 'false'; var_dump( filter_var($int, FILTER_VALIDATE_INT), filter_var($bool, FILTER_VALIDATE_BOOLEAN), filter_var($string, FILTER_VALIDATE_FLOAT), filter_var($string, FILTER_VALIDATE_URL), filter_var($string, FILTER_VALIDATE_IP), filter_var($int, FILTER_VALIDATE_INT, array('flags' => FILTER_NULL_ON_FAILURE)), filter_var($bool, FILTER_VALIDATE_BOOLEAN, array('flags' => FILTER_NULL_ON_FAILURE)), filter_var($string, FILTER_VALIDATE_FLOAT, array('flags' => FILTER_NULL_ON_FAILURE)), filter_var($string, FILTER_VALIDATE_URL, array('flags' => FILTER_NULL_ON_FAILURE)), filter_var($string, FILTER_VALIDATE_IP, array('flags' => FILTER_NULL_ON_FAILURE)) );
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.32, 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 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
bool(false) bool(false) bool(false) bool(false) bool(false) NULL NULL NULL NULL NULL
Output for 5.2.0
bool(false) bool(false) bool(false) string(5) "false" bool(false) NULL NULL NULL string(5) "false" NULL
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Call to undefined function filter_var() in /in/v7QZd on line 6
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: filter_var() in /in/v7QZd on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: filter_var() in /in/v7QZd on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: filter_var() in /in/v7QZd on line 6

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