Today, we will discuss the is_infinite() function in PHP. This function is used to determine whether a value is infinite.

What is the is_infinite() Function?

The is_infinite() function in PHP is a built-in function that is used to determine whether a value is infinite. An infinite value is a number that exceeds the maximum or minimum representable value for its data type, or the result of a mathematical operation that generates an infinite result. The is_infinite() function takes a value as input and returns true if the value is infinite, and false otherwise.

How to Use the is_infinite() Function

Using the is_infinite() function in PHP is very simple. Here is an example of how to use the function:

$number = INF;

// Check if the number is infinite using the is_infinite() function
if (is_infinite($number)) {
  echo "The number is infinite";
} else {
  echo "The number is not infinite";

In this example, we set a variable to an infinite value. We then call the is_infinite() function with the variable as a parameter to check if it is infinite. Finally, we output a message to the screen based on whether the number is infinite or not.


The is_infinite() function in PHP is a useful tool for any PHP developer working with numbers. By using this function, you can determine whether a value is infinite or not, which can be useful in a variety of applications. We hope that this guide has been helpful in understanding how to use the is_infinite() function in your PHP code.

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