PHP Variable Handling is_int() Function

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The PHP Variable Handling is_int() function is used to check if a variable is an integer. It supports PHP 4, PHP 5, PHP 7, and PHP 8. An integer is a whole number, like 10, -5 or 1000. If the variable is an integer, the function will return "true." If the variable isn't an integer, it returns false.

This function is useful for determining whether a given number is an integer. If we want to know whether a value is a number (including numeric strings), we can use is_numeric. This function helps to create error-free and dependable code.

Syntax

Below is the syntax of the PHP Variable Handling is_int() function −

bool is_int ( mixed $value )

Parameters

This function accepts $value parameter which is the variable that we want to check.

Return Value

The is_int() function returns TRUE if the variable is an integer. It returns FALSE if the variable is not an integer.

PHP Version

First introduced in core PHP 4, the is_int() function continues to function easily in PHP 5, PHP 7, and PHP 8.

Example 1

In this simple example we will show the usage of the PHP Variable Handling is_int() function. We will check if the variable $value is an integer. If it is, we will output the message "The value is an integer". Otherwise, we will print the message "The value is not an integer".

Output

Here is the outcome of the following code −

The value is an integer.

Example 2

In the below PHP code we will use the is_int() function and check if a string 20 is considered an integer. Even though the string looks like an integer the function is_int() will return false because it is not an actual integer.

Output

This will generate the below output −

The value is not an integer.

Example 3

Now the below code retrieves specific information from is_int(), and prints it.

Output

This will create the below output −

The value is an integer.

Example 4

Following example demonstrates return values with different types of variables −

Output

This will produce following result −

a is bool(true)
b is bool(false)
c is bool(false)
d is bool(false)
e is bool(false)
f is bool(false)
g is bool(false)