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<?php function isInteger($input){ return(ctype_digit(strval($input))); } $var = ''; if(isInteger($var) === 0){ echo "true"; }else{ echo "false"; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
false