The filter_var() function with the FILTER_VALIDATE_INT filter is used to check if a variable is an integer in PHP.
- TRUE
- FALSE
- nan
- nan
The filter_var() function in PHP with the FILTER_VALIDATE_INT filter is indeed used to check if a variable is an integer. It validates whether the provided value is a valid integer and returns false if it's not, or the validated integer value if it is valid. The FILTER_VALIDATE_INT filter is a useful tool to perform integer validation in PHP. For more details, visit: http://php.net/manual/en/function.filter-var.php
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