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# PHP is_int(), is_integer(), is_long() Functions [PHP Available Functions](#) The **is_int()** function is used to check whether a variable is an integer. **Note:** If you want to test whether a variable is a number or a numeric string (such as form input, which is usually a string), you must use **[is_numeric()](#)**. **Alias Functions:** is_integer(), is_long(). PHP Version Requirement: PHP 4, PHP 5, PHP 7 ### Syntax bool is_int ( mixed $var ) Parameter Description: * $var: The variable to check. ### Return Value Returns TRUE if the specified variable is an integer, otherwise returns FALSE. ### Example ## Example Output: 678 is an integer a678 is not an integerbool(false)[ Is 678 an integer? ]bool(true)[ Is 999 an integer? ]bool(false)[ Is 698.99 an integer? ]bool(false)[ Is Array an integer? ]bool(false)[ Is 125689.66 an integer? ] [PHP Available Functions](#)