FILTER_VALIDATE_INT IN PHP

FILTER_VALIDATE_INT By using FILTER_VALIDATE_INT we can validate variables to check if integer data is present or not. Here is an simple example. $book_id='-41'; // Change this value to get different result if(filter_var($book_id,FILTER_VALIDATE_INT)){ echo " Yes validation passed "; }else{ echo " No validation failed "; } By using filter id of FILTER_VALIDATE_INT the same script can be written as if(filter_var($book_id,257)){ Now let us add one more option where we will assign minimum and maximum acceptable value of the integer. The option is added by using an array $book_id='5'; // Change this value to get different result if(filter_var($book_id,FILTER_VALIDATE_INT, array("options"=>array("min_range"=>-10, "max_range"=>50)) )){ echo " Yes validation passed "; }else{ echo " No validation failed "; } In the above code we have used Minimum value and Maximum value for validating the integer variable. We can also specify only maximum or only minimum value by changing like this. ( One line only ) if(filter_var($book_id,FILTER_VALIDATE_INT, array("options"=>array("min_range"=>8)) )){