The is_int() function is a built-in function in PHP that checks whether a variable is an integer or not. An integer is a data type that represents a whole number.


The syntax of the is_int() function is as follows:

bool is_int(mixed $var)

The function takes a single parameter, $var, which is the variable to be checked for being an integer. The function returns true if the variable is an integer, and false otherwise.

Example Usage

Here is an example of how to use the is_int() function in PHP:

$var1 = 42;
$var2 = "hello";
echo is_int($var1) . "\n";  // output: 1 (true)
echo is_int($var2) . "\n";  // output: (false)

In this example, we define two variables: $var1 is an integer with the value of 42, and $var2 is a string. We then use the is_int() function to check whether each variable is an integer. The output shows that $var1 is an integer (true), while $var2 is not an integer (false).


The is_int() function is a useful tool for checking whether a variable is an integer in PHP. It can be used to ensure that a variable is of the expected type before performing operations on it, or to handle integers and non-integers in a particular way. By using this function, developers can ensure that their code is working with the correct data types and avoid errors that may occur when working with mixed data types.

Practice Your Knowledge

Which of the following statement(s) is/are true about the is_int() function in PHP?

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