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<?php $test = '1' var_dump(is_int($test)); var_dump(!!filter_var($test, FILTER_VALIDATE_INT));
based on FP5E7
Output for 7.1.25 - 7.3.4
Parse error: syntax error, unexpected 'var_dump' (T_STRING) in /in/fiHgt on line 3
Process exited with code 255.